Combat vehicle and plough: what they have in common

1. Step 1. Combat vehicle — includes — Tank. A tank is a kind of combat vehicle.
2. Step 2. Tank — has part — Transmission (gearbox). The transmission carries torque to the drive sprockets and lets the tank turn.
3. Step 3. Transmission (gearbox) — is part of — Tractor. A transmission.
4. Step 4. Tractor — uses — Steel plough. Ploughing with a tractor.
5. Step 5. Steel plough — evolved from — Plough. A steel share.

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