Active noise cancelling and syringe: what they have in common

1. Step 1. Active noise cancelling — uses — Digital signal processor. Signal processing.
2. Step 2. Digital signal processor — is a kind of — Microprocessor. A specialized processor.
3. Step 3. Microprocessor — is part of — Insulin pump. A dosing controller.
4. Step 4. Insulin pump — uses — Insulin. It doses insulin.
5. Step 5. Insulin — uses — Syringe. Injections.

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