Silver and elevator: what they have in common

1. Step 1. Silver — is material for — Wall mirror. Silvering.
2. Step 2. Wall mirror — has part — Window glass. Sheet glass.
3. Step 3. Window glass — is made of — Float glass. Float glass.
4. Step 4. Float glass — is material for — Skyscraper. Glazing.
5. Step 5. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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