Billiard pockets and car: what they have in common

1. Step 1. Billiard pockets — is part of — Billiards. Mesh pockets.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — is used in — Seat belt. It restrains the body during sudden braking.
4. Step 4. Seat belt — is part of — Car. Seat belts.

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