Machine gun and piston pump: what they have in common

1. Step 1. Machine gun — is part of — Tank. The Mark I’s machine guns.
2. Step 2. Tank — has part — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).
3. Step 3. Diesel engine — has part — Cylinder. Cylinders.
4. Step 4. Cylinder — is part of — Piston pump. The piston moves in a cylinder.

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