Needle and refrigerator: what they have in common

1. Step 1. Needle — is part of — Syringe. A hollow needle.
2. Step 2. Syringe — is used in — Vaccine. Injections.
3. Step 3. Vaccine — uses — Cold chain. Cold storage.
4. Step 4. Cold chain — uses — Refrigerator. Refrigerators.

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