Buckle and computer: what they have in common

1. Step 1. Buckle — is part of — Watch strap. A buckle.
2. Step 2. Watch strap — is part of — Wristwatch. A strap.
3. Step 3. Wristwatch — evolved into — Smartwatch. The form factor of a wristwatch.
4. Step 4. Smartwatch — has part — System on a chip (SoC). Inside is a system on a chip.
5. Step 5. System on a chip (SoC) — has part — Graphics processing unit. A graphics core.
6. Step 6. Graphics processing unit — is part of — Computer. The graphics processor draws the picture on screen and also runs neural-network maths.

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