Silver and aeroplane: what they have in common

1. Step 1. Silver — is material for — Syringe. Early needles were silver.
2. Step 2. Syringe — has part — Piston. A plunger.
3. Step 3. Piston — is part of — Shock absorber. Inside, a piston moves in oil.
4. Step 4. Shock absorber — is part of — Landing gear. Shock struts.
5. Step 5. Landing gear — is part of — Aeroplane. Landing gear.

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