Rubber core and lead–acid battery: what they have in common

1. Step 1. Rubber core — is part of — Golf ball. A rubber core.
2. Step 2. Golf ball — is a kind of — Ball. A ball.
3. Step 3. Ball — includes — Football. A ball.
4. Step 4. Football — is made of — Leather. The casing.
5. Step 5. Leather — is material for — Submarine. It was covered with leather.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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