Mixer and sickle: what they have in common

1. Step 1. Mixer — evolved from — Egg beater. A motorized whisk.
2. Step 2. Egg beater — has part — Crank. A handle.
3. Step 3. Crank — is part of — Reaper. A crank moves the knife.
4. Step 4. Reaper — evolved from — Sickle. Mechanical reaping.

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