Hoverboard and fitness tracker: what they have in common

1. Step 1. Hoverboard — has part — Hub motor. Hub motors.
2. Step 2. Hub motor — is part of — Electric unicycle. A hub motor.
3. Step 3. Electric unicycle — has part — Accelerometer. Tilt sensors.
4. Step 4. Accelerometer — is part of — Fitness tracker. A pedometer.

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