GB/T 5743-1994 General technical requirements for marine automatic pilots
Some standard content:
EC629.12.05
National Standard of the People's Republic of China
CB/T 5743—94
General technical specifications of the marine autopilot
Published on 1994- 07-19
State Administration of Technical Supervision
Implemented on 1995-04-01
National Standard of the People's Republic of China
General technical specifications of the marine autopilot
Cenerhl technical specifications for marine autopilot
1 Subject content and applicable model drawings
G6/T 574394
代t5743--85
This standard specifies the technical requirements, test methods, inspection rules, etc. for ship's automatic maneuvers (hereinafter referred to as maneuvers). This standard is applicable to maneuvers used to maintain the ship's heading. 2 Reference standards
GR10250 Electrical compatibility of ship electrical and electronic equipment GB1226 General requirements and test methods for marine navigation equipment CB103B Technical conditions for the packaging of marine navigation instruments CB/Z20G Compass positioning on board
CB*3023 Ship frequency electrical equipment and instruments I wheel plate and label TB2759 General technical specifications for packaging of electromechanical products · 3 Terms
31 Automatic control instrument autopilut
Only the command value is automatically completed. 3.2 Automatic control amaticatcring
The ability to automatically sail the ship on a given course. 3.3 Follow-up control A way to make the machine turn according to a given direction. 3. Simple off steerinig
The ability to make the machine turn according to a given direction. 3.5 Average turning speed nvHageradderrate The quotient of the turning angle from one full boat to another divided by the time interval. 3.6 Course keeping accuracy During dynamic navigation, the sum of the areas between the line of change between points and the line of command heading angle is divided by the time interval. 3. Follow-up sensitivity During automatic control, under the normal working conditions of the system, the minimum initial angle value of the final element of the fast control instrument is activated under the normal working conditions of the system. 3. Follow-up sensitivity During auxiliary control, under the normal working conditions of the system, the minimum initial angle value of the final element of the fast control instrument is activated. 3.9 Atmospheric adjustment device weatherregulltipnunin automatic operation can be based on weather conditions, the special heading sensitivity of the device, the State Technical Supervision Bureau 19940719 batch slip
1995-04-01 specification
GBT5743
3 angle indication signal rudder anxde feed back value refers to a certain indication value of the receiver on the receiving side. 4. Technical requirements
4.1 Environmental conditions
The device should work normally under the following environmental conditions. The ambient temperature
for the equipment installed in the whole case is -15~+55; for the equipment installed outside the cabin and on the deck without insulation measures, it is -25~+7. h. Relative intensity
blue is 93X+2% at 40+3.
c vibration material
tilt 32.55
we are 20°.
modulus±22.6, period 1091
pitch±10°, period 6%.
5--12.5Hz.modulus±1.6tm tolerance±10%, 12.5~-25Hz.amplitude±0.38mm, customer tolerance±1u%25~50Hz.amplitude±0.10mm. customer tolerance±10%, 1.Environmental medium: the solid air around the energy meter contains toxic thin film, 4.2 Ion diffusion class inspection
Energy meter only the atmospheric protection class and equipment identification mark of each instrument shall comply with the provisions of 6.1.1.5.1.2 in GB12267. 4.3 The noise level generated by the instrument during operation shall not exceed 65 (A) for instruments installed in the lower cabin and 75 (A) for instruments installed in the engine room. The radio voltage at the power supply terminal of the instrument under normal working conditions shall not exceed 10-3UMHz within the frequency range. 4.5 Electromagnetic interference interference The instrument should be able to work normally within the transient voltage limit of A4.1.3 of Appendix A of GH1025. 4.6 The minimum safety distance of each instrument at the steering position to the magnetic compass shall comply with the provisions of CB/Z20G. When the safety distance of the steering position is greater than the positioning requirement on board, the minimum safety distance shall be marked. 4.7 Installation of conductors
The conductors in the energy meter should be bundled and laid out, and the movable parts should be protected. The wire ends should be marked with permanent marks consistent with the wiring diagram. The installation should be easy to maintain, and the power cord should be installed separately. 4.8 Purchased accessories and materials
The external accessories and materials used in the energy meter should have a certificate of conformity. They should be durable, flame-retardant, resistant and resistant to condensation. 4.9 Safety and maintenance
4.9.1 The structural design of the energy meter should have measures to prevent accidental access to dangerous voltages inside the equipment, and obvious voltage warning signs should be set inside the equipment
CB/T 5743—94
Over: High\hazard refers to the voltage of the building's electrical warehouse that is higher than 100V. 4.9.2 The casing of each sub-instrument of the steering instrument shall have reliable grounding measures and obvious grounding signs. When the power supply terminal is not grounded, protective grounding shall be adopted for the exposed conductive parts of the equipment:
4.9.3 The effectiveness of the control group shall be minimized as much as possible during design. Measures shall be taken to prevent the control from being mistakenly operating without load. 1.9. All lighting equipment that is working on the positive and negative parts of the driving should be able to adjust the brightness, except for warning and alarm indications. 4 Battery-electrical strength
Under positive test atmospheric conditions, the operating equipment of each sub-instrument shall be subjected to a complete electric strength test: the actual test shall be carried out,
The actual test shall be small! When the FV is equal, the test voltage is: when the rated voltage is greater than 63V, the test voltage should be 2V: the test voltage is any frequency between 45~62H. 4.17 Insulation power supply
Under normal test conditions, the insulation resistance of each receiver in the performance instrument should not be less than the specified M in cold state, 4.15. Under the system conditions, the insulation resistance of the system input terminal to the ground should not be less than M, 1.12 Power supply
The transducer should be able to work normally under the following voltage and frequency fluctuations: The voltage fluctuation is -23% of the rated voltage: a.
h, AC power supply: the voltage fluctuation is 10% of the rated voltage, and the frequency fluctuation is +3% of the rated frequency. The battery power supply voltage fluctuation is -1%~30% of the rated voltage. 4.13 Energy sensitivity
4.13.1 Automatic maneuvering, heading sensitivity should not be greater than 0.5 navigation interval. 4.13.2 Follow-up energy reduction: The maneuvering point sensitivity should not be greater than 1 given energy saving. 4.74.1 In the following cases, the maneuvering instrument will send out sound and light alarm signals: a.
When the power supply of the maneuvering instrument system is lost
When the power supply of the flexible gear device is over-cut, the phase is broken, the liquid level is low
In the working state of the automatic maneuvering instrument, when the yaw value of the ship exceeds the allowed value of the given heading. 4.14.2 The alarm device should be powered by a separate power supply and have corresponding instructions. 4.14.3 The arrival monitoring device should have a mute function. 4.14.4 The alarm meter is changed to a safety meter near the card control console. 4.14.5 The light for indicating obstacles and other alarms should be red, and yellow can be used for alarms that can be handled. 4.15 Energy control device
If there is more than one energy control device, it should meet the following requirements: a.
There are measures to select the energy control device to be put into operation, and there are obvious marks; each control device should have measures to prevent the reverse power of the energy control device from being present at the same time:
The operating direction of each energy control device should be consistent. When the gear wheel is turned left or the torque is applied, it is the energy control left, and when the gear wheel is turned right or the torque is applied, it is the energy control right.
4.16 When two energy control devices are used in conjunction with independent power control devices with the same effect, the selected energy control devices should be installed separately, and the two sets can be operated simultaneously according to user needs. 4.17 Source control
When the power supply is interrupted and then restored, the instrument must automatically resume operation. 4.8 Control mode
GD/T5743-94
The control panel of the steering instrument should be able to realize "automatic", "follow-up", "simple" and other control modes, and display the control mode in a visible position. When the control mode is to be changed, it can be changed within 35 seconds regardless of the original control mode and the position of the blade without any coordination.
4.19 Structural requirements
If the instrument has an input link from \(~9\ digital symbols, its mathematical non-sequential (Conform to the format of (B12267) a.
b. If the instrument does not have an automatic adjustment device for fuel parameters, the weather adjustment device and the test device for changing the navigation with the ship's operational performance should be provided:
c. On the technical cabin control device, if a heading indicator is set, a heading matching device should be set: d. Except for the heading correction device that can adjust the heading, any other button settings should not obviously affect the correct time. When the heading is changed by the heading correction device, one change The range of course change should not be less than +1\. 4.20 Appearance
4.201 There should be no paint peeling, material sac, deformation and end corrosion. 4.20.2 Parts should not be damaged or destroyed, and fastenings should not be loose or fall off. 4.21 Steering speed
For the lower wing, it should not be less than 2.5/8. For the lower rudder, it should not be less than 3.5/9. 4.22 Electrical angle limit adjustment
The maximum limit angle of the electrical angle limit of the probe is 35\. 4.23 Heading stability accuracy
When the automatic snake-guided navigation is at normal speed, after adjusting various parameters, it should meet the requirements that the ship's heading stability accuracy is not less than 1 in sea condition level 3, and the heading stability accuracy is not less than 3 in sea condition level 5. 4.24 Following error
When the following cabin is in operation, within the specified cabin pressure range, the difference between the rudder angle indication value and the set snake angle value should not be greater than 1. 4.25 Reliability
The reliability of the instrument shall be in accordance with the product technical specifications and shall be evaluated or accelerated by the parties agreed by the supply and demand. 5 Test method
5.1 Range voltage test
The test voltage is set at a frequency of 45--62Hz. The power is not less than 2.5kVA. After disconnecting the circuit capacitors, printed circuit boards, semiconductors and other low-voltage parts of the test instrument, all current-carrying parts are connected with a conductor. The voltage between the current-carrying parts and the body is 1. The test starting voltage is 250V. Then increase the voltage at a rate of 100V/. For instruments with a rated voltage of less than 60V, increase the voltage to 2009V. The voltage of the 6CV instrument rises to 5V, and then drops to 25V at the same speed for 1min. The test power supply is disconnected. During the test, if there is no surface flashing, no obvious heating of the insulating parts, and no sudden drop in the test voltage, it is qualified.
Note: For the three-dimensional dielectric test, the dielectric resistance of the three-dimensional dielectric test can be tested in the test. 5.2 Insulation resistance test
Separately connect all the current-carrying parts of the instrument with bare conductors, and use a 590V megohmmeter to measure the insulation resistance between the current-carrying parts and the shell. 5.3 Power supply change test
The instrument is in the automatic operation or automatic selection state, and runs for 5 minutes under each of the cases listed in Table 1. During the test, the control power level should meet the requirements of Article 13. The rudder system works normally and the alarm system works normally. Battery
5.4 Energy sensitivity test
5.4.1 Automatic activation sensitivity test
CB/75743-94
Voltage alternating化(作電乐》
规格化(容度)
Connect the heading analog device and the maneuvering instrument, the maneuvering instrument is in the automatic maneuvering working state, disconnect other control signals, the natural switching device gives a heading signal, slowly turn the heading alarm device to the direction or example, until the technical components of the maneuvering instrument are activated, record the heading value, and then reversely rotate the heading analog device until the maneuvering instrument makes a reverse action, and record the heading scale value. Half of the difference between the two heading values shall comply with the provisions of Article 4.13.1.
5.4.2 Follow-up cabin recording sensitivity
When the cabin instrument is in follow-up control state, turn the energy wheel or knob to the left or right to make the control element work, record the given energy order, then turn the energy wheel or knob to make the control element work, record the given rudder angle value, and half of the interval between the two given rudder angles shall comply with the provisions of Article 4.13.2.
5.5 Temporary device inspection
The alarm state required by artificial setting is set, and the simulated general device is in the working and mute positions. The inspection results shall comply with the requirements of Article 4 and Article 5.
5.6 High temperature test
It shall be carried out in accordance with Article 14.1 of GB12267. The test results shall comply with the provisions of Article 4.13 and 4.20. 5.7 Low temperature test
shall be carried out in accordance with the provisions of 14.3 of G12267, and the test results shall comply with the provisions of 4, 13 and 4.20. 5. Hot test
shall be carried out in accordance with the provisions of 14.2 of G12267, and the test results shall comply with the provisions of 4, 3.1, 4.13 and 4.2. 5.9 Test
The instrument shall be installed in the actual installation mode, either individually or in full on the plug-in table, and the instrument shall be in dynamic working state, tilted 22.5 and tilted 10, and the test shall be carried out for 30 minutes.
Install each device in the energy collector according to the actual installation mode, either individually or in full on the operating table, and the device is in the power-on working state, and the horizontal torsion is 122.5° for a period of 105 seconds, 65 cycles, and the test is carried out for 10 minutes. The test results should comply with the provisions of Article 4.13: there should be no malfunction and functional changes. 5.1C Vibration Test
The energy collector is in the working state, and is fastened to the test table individually or together. The system is in the zero position state. According to the vibration frequency (acceleration) specified in 4.1, the vibration frequency (acceleration) is scanned in two mutually perpendicular directions for 3 minutes per section. 5
GBT5743:94
In each vibration test, a vibration check should be carried out. If there is a source point, it should be eliminated. If it cannot be eliminated, the vibration test should be carried out at the common point in the direction for 2 hours.
The vibration endurance test is carried out according to the requirements of the product, the test rate is <0.11z, the amplitude is 0.101n or the special requirements of the product, the test time is not less than 2h, the test can be carried out in three directions, vertically, horizontally and vertically according to the test results. The test results meet the requirements of 4.13 and 4.2. 5.11 Salt spray test
According to the provisions of GB1225 Section 14.8, the test results should not have obvious steel on the metal surface. If the manufacturer has a salt spray test qualified report for metal parts, this test can be carried out within the validity period. 5.12 Exposure test
According to the provisions of 6B132G Section 14.? The test results show that the degree of penetration shall not exceed Level 2. No manufacturing! If the test report of the qualified teaching materials or trace materials is available, this test can be exempted within the validity period. 5.13 Water test
For the transmitter installed outside the cabin and on the damaged cabin without insulation measures, it shall be carried out according to the requirements of 14.5 of H27. The test results shall show no signs that water has entered the parts that may affect the performance of the instrument. 5.14 Noise test
It shall be carried out according to the provisions of Article 15.5 of CB12257. The test results shall comply with the provisions of Article 4.3.
5.15 Interference test
The conducted interference test shall be carried out according to the provisions of Article 15.2 of CB12267, and the test results shall comply with the provisions of Article 4.4.
5.16 Interference test
It shall be carried out according to the provisions of A4.1.1 and A4.1.2 of Appendix 4 of GB10250 when the transmitter is in the energized working state.
The test results shall comply with the provisions of Article 4.5,
5.17 Test of navigation stability accuracy
The ship shall sail in economic efficiency and the probe shall be in the working state of automatic test. In the (~3) level navigation condition and stable state, the X-ray automatic recorder shall be used to record the course changes of the ship in the head waves, following waves, and rolling and rolling respectively. The time for each change shall not be less than 1cm. The course stability accuracy shall be the sum of the areas between the above-mentioned course change curve and the straight line of the stable course. In the 4~5 level navigation condition and stable course state, the X-ray automatic recorder shall be used to record the course change curve of the ship in the head waves, following waves, and rolling and rolling respectively. The time for each change shall not be less than 1cm. The course stability accuracy shall be the sum of the areas between the above-mentioned course change curve and the straight line of the stable course divided by the test time. No XY automatic recorder shall be provided.The test can be carried out in the following way: i.e., the course is recorded for 15~20min at a fixed time (e.g., 5s), and the following method is used for calculation.
Where: 6——course accuracy:
n number of measurements
·the course value recorded for the first time.
The test result shall comply with the requirements of 1.23. 5.18 Follow-up difference test
=(Zg)/n
In the follow-up state, turn the wheel or knob to give a 0°, ±5°, ±1°, ±21% ±3U command, and observe the difference between the rudder angle indication and the above command value when the wheel or knob is in the above position. F. The
test characteristics shall comply with the requirements of 4.24. 5.19 System test
GB/T574394
The mooring test of the instrument is carried out after installation on board. The test is carried out according to the requirements of 4.13.1.14, 1.75.4.164.17, 4.18, 4.21, 4.22, 4.24 and the corresponding test methods. 5.20 Navigation test
After the instrument passes the system test, the navigation test is carried out according to the requirements of 4.23 and the test method of 5.17. 6 Inspection rules
6.1 Inspection classification
The inspection of the instrument is divided into factory inspection and type inspection. 6.2 Factory inspection
6.2.1 The following inspections are carried out by the product quality inspection department and the inspection department of the manufacturer at the same time. All products should be inspected by the factory. The delivered products must be debugged according to the procedures specified in the product technical documents and accompanied by the corresponding debugging and operation requirements. Out! The inspection is carried out according to Table 2.
Safety height
Wire installation
Safety and protection
Operation energy control brush installation calculation
Double set replacement data
Electric control
Lifting type
Average double requirements
Average transfer speed
Electric energy angle limit installation pad
Continuous dielectric strength
Insulation resistance
Operational fatigue slowness
Lifting device
Environmental inspection||t Factory connection
Ink test
Technical requirements
Basic risk
Cover and support
Relative resistance
Basic basis
Environmental environment
Protection type
Electromagnetic interference
Air meat determination
Insulation standard
Out, inspection
CO/T5743-94
Technical requirements
tI c..d.
Test method
5.11,5.12
Monitoring time
6.2.2 The instrument can leave the factory after being inspected by the inspection department and auxiliary inspection department of the manufacturer. The products leaving the factory should be accompanied by a qualification certificate. 6.3 Type inspection
6.3.tType inspection is conducted under one of the following circumstances: a.
When new products are trial-produced,
When the changes in design, process or materials are sufficient to affect the performance, h.
When the annual output of batch production is greater than 25 sets or the planned production is 8 sets. Type inspection is conducted according to Table 2,
6.3-2 Sample plan and judgment rules
According to the type inspection operator, one item must be randomly selected from the products that have passed the factory inspection. If a certain item is not qualified during the inspection, the cause should be found out. After eliminating the reason, the inspection item and related items should be re-conducted. After the inspection is completed, the remaining items can be inspected. If the fault cannot be eliminated, collect the whole batch of instruments, re-select the inspection of this item and the items related to the control item inspection. If one of the instruments is still unsatisfactory, the type inspection will be terminated. From the same list of products, it is allowed to select one type of product with chemical safety performance for type inspection. If it is qualified, the type inspection of the series of products is considered to be qualified.
Marking, storage, and storage
7.1 Marking
7.7.1 The following flame retardant and delay marks shall be placed in an obvious position on the main instrument: manufacturer name
product name
screening mark
product mark:
manufacturing date or factory number
ship inspection mark.
GB/T 5743--94
7.1.2 Each analyzer of the energy meter shall be marked with the instrument name and model at the necessary location. All labels and labels shall comply with the provisions of GB*3023. 1.2 Packaging
The packaging of the energy meter shall comply with the provisions of JB2759. 7.3 Transportation
The transportation of the energy meter shall comply with the provisions of JB2759. 7.4 Operation
The energy meter shall be stored in a clean, well-ventilated environment with a temperature of -5--35 and a relative humidity of no more than 75%. The air shall not contain corrosive gases. When the storage time exceeds one to six months, it shall be powered on every six months. 3 Quality Assurance and Service
1 If the instrument is damaged or cannot work normally due to poor quality during the warranty period, the system shall provide free repair, replacement of parts or replacement, and repair for a period of
months.? Manufacturers should provide product certification, product manual, packing list, tool signature list, installation drawings and other relevant technical information for each variable energy meter.
Additional notes:
This standard is not issued by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the National Marine Instrument Technical Committee of the National Marine Standardization Technical Committee. This standard is drafted and revised by Dajiang Instrument Factory. The main drafters of this standard are Yu Jiaduan, Huang Changxu, Zeng Nenghuan, Yang Duanyang and Hu Benyi. This standard adopts the original IM0 (LX) A.34 performance standard of automatic energy meter. It complies with the relevant provisions of the comprehensive text of the International Convention for the Safety of Life at Sea (50) LAS issued in 1966. This standard was issued for the 12th time in 1965.
When the annual output of batch production is greater than 25 sets or the planned production is 8 sets. Type inspection is carried out according to Table 2.
6.3-2 Sample plan and judgment rules
According to the operator of type inspection, one item must be randomly selected from the products that have passed the factory inspection. If a certain item is not qualified during the inspection, the cause should be found out. After eliminating the reason, the inspection of this item and the related items should be re-conducted, and the inspection of the remaining items can be continued after the inspection is completed. If the fault cannot be eliminated, collect the whole batch of instruments, re-select the inspection of this item and the items related to the control item inspection. If one of the instruments is still unsatisfactory, the type inspection will be terminated. From the same list of products, it is allowed to select one type of product with chemical safety performance for type inspection. If it is qualified, the type inspection of the series of products is considered to be qualified.
Marking, storage, and storage
7.1 Marking
7.7.1 The following flame retardant and delay marks shall be placed in an obvious position on the main instrument: manufacturer name
product name
screening mark
product mark:
manufacturing date or factory number
ship inspection mark.
GB/T 5743--94
7.1.2 Each analyzer of the energy meter shall be marked with the instrument name and model at the necessary location. All labels and labels shall comply with the provisions of GB*3023. 1.2 Packaging
The packaging of the energy meter shall comply with the provisions of JB2759. 7.3 Transportation
The transportation of the energy meter shall comply with the provisions of JB2759. 7.4 Operation
The energy meter shall be stored in a clean, well-ventilated environment with a temperature of -5--35 and a relative humidity of no more than 75%. The air shall not contain corrosive gases. When the storage time exceeds one to six months, it shall be powered on every six months. 3 Quality Assurance and ServiceWww.bzxZ.net
1 If the instrument is damaged or cannot work normally due to poor quality during the warranty period, the system shall provide free repair, replacement of parts or replacement, and repair for a period of
months.? Manufacturers should provide product certification, product manual, packing list, tool signature list, installation drawings and other relevant technical information for each variable energy meter.
Additional notes:
This standard is not issued by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the National Marine Instruments Technical Committee of the National Marine Standardization Technical Committee. This standard is drafted and revised by Dajiang Instrument Factory. The main drafters of this standard are Yu Jiaduan, Huang Changxu, Zeng Nenghuan, Yang Duanyang and Hu Benyi. This standard adopts the original IM0 (LX) A.34 performance standard for automatic energy meters. It complies with the relevant provisions of the comprehensive text of the International Convention for the Safety of Life at Sea (50) LAS issued in 1966. This standard was issued for the 12th time in 1965.
When the annual output of batch production is greater than 25 sets or the planned production is 8 sets. Type inspection is carried out according to Table 2.
6.3-2 Sample plan and judgment rules
According to the operator of type inspection, one item must be randomly selected from the products that have passed the factory inspection. If a certain item is not qualified during the inspection, the cause should be found out. After eliminating the reason, the inspection of this item and the related items should be re-conducted, and the inspection of the remaining items can be continued after the inspection is completed. If the fault cannot be eliminated, collect the whole batch of instruments, re-select the inspection of this item and the items related to the control item inspection. If one of the instruments is still unsatisfactory, the type inspection will be terminated. From the same list of products, it is allowed to select one type of product with chemical safety performance for type inspection. If it is qualified, the type inspection of the series of products is considered to be qualified.
Marking, storage, and storage
7.1 Marking
7.7.1 The following flame retardant and delay marks shall be placed in an obvious position on the main instrument: manufacturer name
product name
screening mark
product mark:
manufacturing date or factory number
ship inspection mark.
GB/T 5743--94
7.1.2 Each analyzer of the energy meter shall be marked with the instrument name and model at the necessary location. All labels and labels shall comply with the provisions of GB*3023. 1.2 Packaging
The packaging of the energy meter shall comply with the provisions of JB2759. 7.3 Transportation
The transportation of the energy meter shall comply with the provisions of JB2759. 7.4 Operation
The energy meter shall be stored in a clean, well-ventilated environment with a temperature of -5--35 and a relative humidity of no more than 75%. The air shall not contain corrosive gases. When the storage time exceeds one to six months, it shall be powered on every six months. 3 Quality Assurance and Service
1 If the instrument is damaged or cannot work normally due to poor quality during the warranty period, the system shall provide free repair, replacement of parts or replacement, and repair for a period of
months.? Manufacturers should provide product certification, product manual, packing list, tool signature list, installation drawings and other relevant technical information for each variable energy meter.
Additional notes:
This standard is not issued by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the National Marine Instrument Technical Committee of the National Marine Standardization Technical Committee. This standard is drafted and revised by Dajiang Instrument Factory. The main drafters of this standard are Yu Jiaduan, Huang Changxu, Zeng Nenghuan, Yang Duanyang and Hu Benyi. This standard adopts the original IM0 (LX) A.34 performance standard of automatic energy meter. It complies with the relevant provisions of the comprehensive text of the International Convention for the Safety of Life at Sea (50) LAS issued in 1966. This standard was issued for the 12th time in 1965.
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