Linen and electric fan: what they have in common

1. Step 1. Linen — is material for — Lateen sail. Sails were sewn from linen and cotton.
2. Step 2. Lateen sail — uses — Lift. A fore-and-aft sail works like a wing.
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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