Forge and lead–acid battery: what they have in common

1. Step 1. Forge — has part — Bellows. Bellows fan the fire of the forge.
2. Step 2. Bellows — is made of — Leather. Bellows are a leather bag.
3. Step 3. Leather — is material for — Submarine. It was covered with leather.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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