Cipher machine and greenhouse: what they have in common

1. Step 1. Cipher machine — has part — Keyboard. A keyboard.
2. Step 2. Keyboard — is part of — Linotype. A keyboard.
3. Step 3. Linotype — uses — Casting. It casts a line of type in metal.
4. Step 4. Casting — is used in — Window glass. The panes were cast in moulds.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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