Jack and zip: what they have in common

1. Step 1. Jack — has part — Piston pump. A hand plunger pump.
2. Step 2. Piston pump — works like — Syringe. A syringe is a hand-operated piston pump.
3. Step 3. Syringe — has part — Needle. A hollow needle.
4. Step 4. Needle — is used in — Trousers. Trousers were sewn with a needle.
5. Step 5. Trousers — has part — Zip. A fastener.

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