Crutch uprights and greenhouse: what they have in common

1. Step 1. Crutch uprights — is part of — Crutches. Two uprights.
2. Step 2. Crutches — uses — Lever. A support.
3. Step 3. Lever — is used in — Shaduf. A shaduf is a lever with a counterweight.
4. Step 4. Shaduf — is used in — Irrigation. The shaduf fed water into the canals.
5. Step 5. Irrigation — is used in — Greenhouse. Watering plants.

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