Bauxite and boyle’s air pump: what they have in common

1. Step 1. Bauxite — is material for — Aluminium. The ore.
2. Step 2. Aluminium — is material for — Aerosol can. The can.
3. Step 3. Aerosol can — has part — Valve. A valve.
4. Step 4. Valve — is part of — Boyle’s air pump. Valves.

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