Bike sharing and incandescent light bulb: what they have in common

1. Step 1. Bike sharing — uses — Bicycle. Bicycles.
2. Step 2. Bicycle — has part — Bike light with dynamo. A lamp.
3. Step 3. Bike light with dynamo — has part — LED. An LED.
4. Step 4. LED — is part of — Torch (flashlight). Modern torches use LEDs.
5. Step 5. Torch (flashlight) — has part — Incandescent light bulb. A bulb (today an LED).

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