Pair of chopsticks and steam locomotive: what they have in common

1. Step 1. Pair of chopsticks — is part of — Chopsticks. Tapering rods.
2. Step 2. Chopsticks — is a kind of — Cutlery. Chopsticks are East Asian cutlery.
3. Step 3. Cutlery — has part — Knife. Knives.
4. Step 4. Knife — is part of — Meat grinder. A cross-shaped blade.
5. Step 5. Meat grinder — has part — Crank. A handle.
6. Step 6. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.

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