Night-vision device and router: what they have in common

1. Step 1. Night-vision device — has part — Lens. Optics.
2. Step 2. Lens — is part of — Endoscope. Optics.
3. Step 3. Endoscope — has part — Optical fibre. Flexible endoscopes use optical fibre.
4. Step 4. Optical fibre — is part of — Internet. The backbones are optical fibre.
5. Step 5. Internet — has part — Router. A network of routers.

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