Polio vaccine and saw: what they have in common

1. Step 1. Polio vaccine — is a kind of — Vaccine. A vaccine.
2. Step 2. Vaccine — uses — Syringe. Injections.
3. Step 3. Syringe — has part — Needle. A hollow needle.
4. Step 4. Needle — uses — Wedge. The point pushes the material apart like a wedge.
5. Step 5. Wedge — is used in — Saw. Each tooth of a saw is a small wedge.

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