Foam midsole and lead–acid battery: what they have in common

1. Step 1. Foam midsole — is part of — Trainers. Cushioning foam.
2. Step 2. Trainers — is a kind of — Footwear. Footwear.
3. Step 3. Footwear — is made of — Leather. Leather.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.
5. Step 5. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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