Nickel–metal hydride battery and aerosol can: what they have in common

1. Step 1. Nickel–metal hydride battery — is part of — Hybrid car. The first Prius had a NiMH battery.
2. Step 2. Hybrid car — has part — Internal combustion engine. A combustion engine.
3. Step 3. Internal combustion engine — has part — Valve. Valves let in the mixture and let out the gases.
4. Step 4. Valve — is part of — Aerosol can. A valve.

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