IRC and laser: what they have in common

1. Step 1. IRC — uses — Internet. Internet chat.
2. Step 2. Internet — has part — Optical fibre. The backbones are optical fibre.
3. Step 3. Optical fibre — uses — Laser diode. The source is a laser.
4. Step 4. Laser diode — is a kind of — Laser. A semiconductor laser.

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