Fuel cell and bicycle: what they have in common

1. Step 1. Fuel cell — is part of — Hydrogen car. A fuel cell.
2. Step 2. Hydrogen car — is made of — Carbon fibre. The tanks are carbon fibre.
3. Step 3. Carbon fibre — is material for — Bicycle frame. Carbon frames.
4. Step 4. Bicycle frame — is part of — Bicycle. The frame ties all the units together and carries the rider.

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