Racket frame and syringe: what they have in common

1. Step 1. Racket frame — is part of — Tennis racket. The frame of the racket head.
2. Step 2. Tennis racket — uses — Ball. A ball.
3. Step 3. Ball — is made of — Natural rubber. The rubber balls of Mesoamerica.
4. Step 4. Natural rubber — is material for — IV drip. And rubber tubes.
5. Step 5. IV drip — has part — Syringe. A needle.

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