Car brake and oil well: what they have in common

1. Step 1. Car brake — has part — Brake caliper. A caliper.
2. Step 2. Brake caliper — has part — Piston. Pistons.
3. Step 3. Piston — is part of — Diesel engine. Pistons move in the cylinders.
4. Step 4. Diesel engine — is part of — Drilling rig. The drive.
5. Step 5. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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