Wave power station and fitness tracker: what they have in common

1. Step 1. Wave power station — has part — Electric generator. A generator.
2. Step 2. Electric generator — is part of — Bike light with dynamo. A dynamo.
3. Step 3. Bike light with dynamo — has part — LED. An LED.
4. Step 4. LED — is part of — Pulse oximeter. Red and infrared LEDs.
5. Step 5. Pulse oximeter — is part of — Fitness tracker. An optical heart-rate sensor.

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