Trainers and electrical grid: what they have in common

1. Step 1. Trainers — is made of — Vulcanized rubber. The sole.
2. Step 2. Vulcanized rubber — is material for — Pneumatic tyre. A tyre is made of vulcanized rubber.
3. Step 3. Pneumatic tyre — is part of — Electric car. An electric car’s wheels have pneumatic tyres.
4. Step 4. Electric car — uses — Charging station. It charges at charging stations.
5. Step 5. Charging station — uses — Electrical grid. Powered from the grid.

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