Warehouse robot and internet: what they have in common

1. Step 1. Warehouse robot — uses — Barcode. Navigation by markers.
2. Step 2. Barcode — uses — Laser diode. Barcode scanners use lasers.
3. Step 3. Laser diode — is used in — Optical fibre. The source is a laser.
4. Step 4. Optical fibre — is part of — Internet. The backbones are optical fibre.

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