Maglev and aerosol can: what they have in common

1. Step 1. Maglev — is made of — Concrete. The guideway is concrete.
2. Step 2. Concrete — is material for — Panama Canal. The locks are concrete.
3. Step 3. Panama Canal — has part — Canal lock. Locks.
4. Step 4. Canal lock — has part — Valve. Sluice gates.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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