Absorbent core and watt steam engine: what they have in common

1. Step 1. Absorbent core — is part of — Disposable nappy. Cellulose with a superabsorbent.
2. Step 2. Disposable nappy — is made of — Polyethylene. Film.
3. Step 3. Polyethylene — is material for — Skateboard. The wheels are polyurethane.
4. Step 4. Skateboard — has part — Wheel. Four wheels.
5. Step 5. Wheel — is part of — Steam locomotive. The steam engine turns the driving wheels.
6. Step 6. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.

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