Hydrofoil wings and boiler: what they have in common

1. Step 1. Hydrofoil wings — is part of — Hydrofoil. They lift the hull out of the water.
2. Step 2. Hydrofoil — has part — Diesel engine. An engine.
3. Step 3. Diesel engine — is part of — Excavator. The drive is a diesel.
4. Step 4. Excavator — has part — Boiler. The first excavators were steam-powered.

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