Pneumatic tyre and syringe: what they have in common

1. Step 1. Pneumatic tyre — is part of — Landing gear. Aircraft tyres.
2. Step 2. Landing gear — has part — Shock absorber. Shock struts.
3. Step 3. Shock absorber — has part — Piston. Inside, a piston moves in oil.
4. Step 4. Piston — is part of — Syringe. A plunger.

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