Exercise bike and car: what they have in common

1. Step 1. Exercise bike — has part — Flywheel. A flywheel.
2. Step 2. Flywheel — is part of — Potter’s wheel. A lower flywheel turned by the foot.
3. Step 3. Potter’s wheel — has part — Axle. A vertical axis.
4. Step 4. Axle — is part of — Car. A car's wheels sit on axles.

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