Axe poll and greenhouse: what they have in common

1. Step 1. Axe poll — is part of — Axe. The back part for striking.
2. Step 2. Axe — is made of — Stone. A Neolithic axe is ground stone on a handle.
3. Step 3. Stone — is material for — Gothic cathedral. Cathedrals are built of dressed stone.
4. Step 4. Gothic cathedral — has part — Window glass. Stained glass.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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