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

1. Step 1. Night-vision device — has part — Lens. Optics.
2. Step 2. Lens — is part of — Otoscope. A lens.
3. Step 3. Otoscope — has part — LED. Illumination.
4. Step 4. LED — is part of — Bike light with dynamo. An LED.
5. Step 5. Bike light with dynamo — is part of — Bicycle. A lamp.

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