Central heating and paper machine: what they have in common

1. Step 1. Central heating — has part — Valve. Valves on the radiators set how much hot water flows into a room.
2. Step 2. Valve — is part of — Flush toilet. The cistern’s float valve.
3. Step 3. Flush toilet — uses — Toilet paper. Hygiene.
4. Step 4. Toilet paper — is made of — Wood pulp. Cellulose.
5. Step 5. Wood pulp — is used in — Paper machine. The raw material.

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