Machine gun and shipping container: 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 — is part of — Container ship. A slow-speed diesel.
4. Step 4. Container ship — uses — Shipping container. Carries standard containers.

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