LNG carrier and rock drill: what they have in common

1. Step 1. LNG carrier — is a kind of — Tanker. A tanker.
2. Step 2. Tanker — has part — Diesel engine. A diesel.
3. Step 3. Diesel engine — has part — Piston. Pistons move in the cylinders.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.

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