Folding bicycle and aerosol can: what they have in common

1. Step 1. Folding bicycle — has part — Bicycle drivetrain. The drive.
2. Step 2. Bicycle drivetrain — has part — Pedal. The pedals take the force of the legs.
3. Step 3. Pedal — is part of — Moped. A moped can be pedalled.
4. Step 4. Moped — has part — Internal combustion engine. A small-displacement combustion engine.
5. Step 5. Internal combustion engine — has part — Valve. Valves let in the mixture and let out the gases.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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