In which part of the bike a left-handed screw is used?

seat
steering
pedals
rear sprockets
For bicycle pedals, the screw on the right must be reverse-threaded, or the pedal will unscrew during use, being subject to counterclockwise torque (which would work to undo a right-hand thread).
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seat
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rear sprockets
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10454
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380
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145
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15
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34%
29
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33%
33%
12
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33