Assembly line and fitness tracker: what they have in common

1. Step 1. Assembly line — is used in — Car. The Ford Model T was the first mass-produced assembly-line car.
2. Step 2. Car — has part — Airbag. Airbags.
3. Step 3. Airbag — has part — Accelerometer. The crash sensor is an accelerometer.
4. Step 4. Accelerometer — is part of — Fitness tracker. A pedometer.

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