Metal shackle and smart meter: what they have in common

1. Step 1. Metal shackle — is part of — Padlock. A steel clip.
2. Step 2. Padlock — is a kind of — Lock and key. A padlock.
3. Step 3. Lock and key — evolved into — Smart lock. An electronic lock.
4. Step 4. Smart lock — has part — Microcontroller. A microcontroller checks access.
5. Step 5. Microcontroller — is part of — Smart meter. A microcontroller does the metering.

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