Anchor windlass and sewage treatment plant: what they have in common

1. Step 1. Anchor windlass — has part — Ratchet. A stopper.
2. Step 2. Ratchet — is part of — Turnstile. A ratchet.
3. Step 3. Turnstile — is part of — Metro. Turnstiles.
4. Step 4. Metro — is made of — Brick. The vaults of the first tunnels are brick.
5. Step 5. Brick — is material for — Sewerage. The drains of Mohenjo-daro are lined with fired brick.
6. Step 6. Sewerage — has part — Sewage treatment plant. Treatment plants.

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