Charcoal and car: what they have in common

1. Step 1. Charcoal — is material for — Gunpowder. Gunpowder is a mix of saltpetre, sulphur and charcoal.
2. Step 2. Gunpowder — is used in — Cartridge. The charge.
3. Step 3. Cartridge — is part of — Machine gun. Cartridges in a belt.
4. Step 4. Machine gun — is part of — Armoured car. A machine gun.
5. Step 5. Armoured car — evolved from — Car. A car with armour.

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