Mosin rifle and greenhouse: what they have in common

1. Step 1. Mosin rifle — has part — Gun barrel. A rifled barrel.
2. Step 2. Gun barrel — is part of — Cannon. A cast barrel.
3. Step 3. Cannon — uses — Casting. Barrels were cast.
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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