Pallet deck boards and submarine: what they have in common

1. Step 1. Pallet deck boards — is part of — Pallet. Boards on which the load is placed.
2. Step 2. Pallet — works like — Shipping container. Standardizing units of cargo.
3. Step 3. Shipping container — is used in — Container ship. Carries standard containers.
4. Step 4. Container ship — has part — Diesel engine. A slow-speed diesel.
5. Step 5. Diesel engine — is part of — Submarine. Diesel-electric submarines.

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