Bitumen and shaduf: what they have in common

1. Step 1. Bitumen — is made of — Crude oil. The residue of oil distillation.
2. Step 2. Crude oil — is material for — Nylon. The raw material is petrochemical.
3. Step 3. Nylon — is material for — Climbing rope. Nylon.
4. Step 4. Climbing rope — evolved from — Rope. A rope.
5. Step 5. Rope — is used in — Well. Water was raised with a bucket on a rope.
6. Step 6. Well — uses — Shaduf. Or with a well sweep.

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