Kite frame of sticks and electric fan: what they have in common

1. Step 1. Kite frame of sticks — is part of — Kite. Light battens set the plane and shape of the kite.
2. Step 2. Kite — uses — Lift. A kite is held up by lift.
3. Step 3. Lift — is used in — Wind tunnel. Measuring lift.
4. Step 4. Wind tunnel — has part — Electric fan. A fan.

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