Damascus steel and sewage treatment plant: what they have in common

1. Step 1. Damascus steel — is material for — Sword. Damascus blades.
2. Step 2. Sword — has part — Handle. A handle.
3. Step 3. Handle — is part of — Trowel. A handle on a curved neck.
4. Step 4. Trowel — is used in — Brick. Bricklaying with a trowel.
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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