Photocopier and bicycle: what they have in common

1. Step 1. Photocopier — is made of — Carbon. Toner is carbon black in resin.
2. Step 2. Carbon — is material for — Carbon fibre. Carbon.
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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