Cling film and steam locomotive: what they have in common

1. Step 1. Cling film — is made of — Polyethylene. Polyethylene.
2. Step 2. Polyethylene — is material for — Skateboard. The wheels are polyurethane.
3. Step 3. Skateboard — has part — Wheel. Four wheels.
4. Step 4. Wheel — is part of — Steam locomotive. The steam engine turns the driving wheels.

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