Synthetic rubber and fuel cell: what they have in common

1. Step 1. Synthetic rubber — is material for — Pneumatic tyre. Modern tyres are mostly synthetic rubber.
2. Step 2. Pneumatic tyre — is part of — Electric car. An electric car’s wheels have pneumatic tyres.
3. Step 3. Electric car — includes — Hydrogen car. A hydrogen-powered electric car.
4. Step 4. Hydrogen car — has part — Fuel cell. A fuel cell.

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