Boot shaft and syringe: what they have in common

1. Step 1. Boot shaft — is part of — Wellington boots. The tall part.
2. Step 2. Wellington boots — is made of — Natural rubber. The first rubber boots were natural rubber.
3. Step 3. Natural rubber — is material for — IV drip. And rubber tubes.
4. Step 4. IV drip — has part — Syringe. A needle.

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