Greenhouse frame and joystick: what they have in common

1. Step 1. Greenhouse frame — is part of — Greenhouse. A metal or wooden frame.
2. Step 2. Greenhouse — uses — Irrigation. Watering plants.
3. Step 3. Irrigation — uses — Shaduf. The shaduf fed water into the canals.
4. Step 4. Shaduf — uses — Lever. A shaduf is a lever with a counterweight.
5. Step 5. Lever — is used in — Joystick. A lever.

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