Sprocket and steam locomotive: what they have in common

1. Step 1. Sprocket — is part of — Bicycle drivetrain. The front and rear sprockets set the gear ratio.
2. Step 2. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
3. Step 3. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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