Crumple zone and aerosol can: what they have in common

1. Step 1. Crumple zone — is part of — Car body. Crumple zones.
2. Step 2. Car body — is part of — SUV. A body.
3. Step 3. SUV — has part — Internal combustion engine. An internal combustion engine.
4. Step 4. Internal combustion engine — has part — Valve. Valves let in the mixture and let out the gases.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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