Heating stove and rock drill: what they have in common

1. Step 1. Heating stove — is made of — Brick. Or built of brick.
2. Step 2. Brick — is material for — Metro. The vaults of the first tunnels are brick.
3. Step 3. Metro — uses — Tunnel. Tunnels.
4. Step 4. Tunnel — uses — Rock drill. Driving the Mont Cenis tunnel.

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