Cutlery and railway track: what they have in common

1. Step 1. Cutlery — has part — Knife. Knives.
2. Step 2. Knife — is part of — Meat grinder. A cross-shaped blade.
3. Step 3. Meat grinder — has part — Crank. A handle.
4. Step 4. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
5. Step 5. Steam locomotive — uses — Railway track. It runs on rails.

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