Glucose meter and electric generator: what they have in common

1. Step 1. Glucose meter — has part — Liquid-crystal display. A screen.
2. Step 2. Liquid-crystal display — has part — LED. LED backlighting.
3. Step 3. LED — is part of — Bike light with dynamo. An LED.
4. Step 4. Bike light with dynamo — has part — Electric generator. A dynamo.

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