Strings and electric fan: what they have in common

1. Step 1. Strings — is part of — Tennis racket. A string bed.
2. Step 2. Tennis racket — uses — Ball. A ball.
3. Step 3. Ball — includes — Golf ball. A ball.
4. Step 4. Golf ball — uses — Drag. The dimples reduce drag.
5. Step 5. Drag — is used in — Wind tunnel. Measuring resistance.
6. Step 6. Wind tunnel — has part — Electric fan. A fan.

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