Harp and conveyor belt: what they have in common

1. Step 1. Harp — has part — Strings. Stretched strings of different lengths.
2. Step 2. Strings — is part of — Tennis racket. A string bed.
3. Step 3. Tennis racket — uses — Ball. A ball.
4. Step 4. Ball — includes — Football. A ball.
5. Step 5. Football — is made of — Leather. The casing.
6. Step 6. Leather — is material for — Conveyor belt. The first belts were leather.

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