Sports car and syringe: what they have in common

1. Step 1. Sports car — has part — Car brake. Brakes.
2. Step 2. Car brake — has part — Brake caliper. A caliper.
3. Step 3. Brake caliper — has part — Piston. Pistons.
4. Step 4. Piston — is part of — Syringe. A plunger.

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