Codex (book) and solar panel: what they have in common

1. Step 1. Codex (book) — evolved into — E-reader. An electronic book.
2. Step 2. E-reader — has part — Flash memory. Memory.
3. Step 3. Flash memory — is part of — Microcontroller. Program memory.
4. Step 4. Microcontroller — is part of — CubeSat. On-board electronics.
5. Step 5. CubeSat — has part — Solar panel. Power comes from solar panels.

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