Pipeline and chisel: what they have in common

1. Step 1. Pipeline — is part of — Chemical plant. Pipelines between the vessels.
2. Step 2. Chemical plant — is made of — Brick. The furnaces and towers are brick.
3. Step 3. Brick — is material for — Metro. The vaults of the first tunnels are brick.
4. Step 4. Metro — uses — Tunnel. Tunnels.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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