Model railway and elevator: what they have in common

1. Step 1. Model railway — is made of — Tin. The first models were tinplate.
2. Step 2. Tin — is used in — Float glass. Glass spreads out over molten tin.
3. Step 3. Float glass — is material for — Skyscraper. Glazing.
4. Step 4. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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