Coal and plumbing: what they have in common

1. Step 1. Coal — is used in — Power station. The first stations ran on coal.
2. Step 2. Power station — is made of — Brick. The buildings of the first power stations were brick.
3. Step 3. Brick — is material for — Water tower. Water towers are brick.
4. Step 4. Water tower — is part of — Plumbing. Maintaining pressure.

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