Freewheel and knife: what they have in common

1. Step 1. Freewheel — is part of — Bicycle drivetrain. A freewheel.
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 — Meat grinder. A handle.
4. Step 4. Meat grinder — has part — Knife. A cross-shaped blade.

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