Rifle magazine and car: what they have in common

1. Step 1. Rifle magazine — is part of — Mosin rifle. Five cartridges.
2. Step 2. Mosin rifle — has part — Bolt action. A bolt action.
3. Step 3. Bolt action — uses — Cartridge. A unitary cartridge.
4. Step 4. Cartridge — is part of — Machine gun. Cartridges in a belt.
5. Step 5. Machine gun — is part of — Armoured car. A machine gun.
6. Step 6. Armoured car — evolved from — Car. A car with armour.

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