Knife and bicycle: what they have in common

1. Step 1. Knife — is part of — Meat grinder. A cross-shaped blade.
2. Step 2. Meat grinder — has part — Crank. A handle.
3. Step 3. Crank — is part of — Bicycle drivetrain. The cranks turn the motion of the legs into rotation.
4. Step 4. Bicycle drivetrain — is part of — Bicycle. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.

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