Sewerage and transformer: what they have in common

1. Step 1. Sewerage — is made of — Brick. The drains of Mohenjo-daro are lined with fired brick.
2. Step 2. Brick — is material for — Power station. The buildings of the first power stations were brick.
3. Step 3. Power station — is part of — Electrical grid. Power stations feed the grid.
4. Step 4. Electrical grid — has part — Transformer. Transformer substations.

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