Car brake and aerosol can: what they have in common

1. Step 1. Car brake — has part — Brake caliper. A caliper.
2. Step 2. Brake caliper — has part — Piston. Pistons.
3. Step 3. Piston — is part of — Boyle’s air pump. A plunger.
4. Step 4. Boyle’s air pump — has part — Valve. Valves.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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