Leather seat and rope: what they have in common

1. Step 1. Leather seat — is part of — Saddle. A leather seat.
2. Step 2. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.
3. Step 3. Bicycle — uses — Angular momentum. The spinning wheels and the steering geometry help keep balance.
4. Step 4. Angular momentum — is used in — Yo-yo. Rotation.
5. Step 5. Yo-yo — has part — Rope. A thread.

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