Codex (book) and radar: 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 — Flight recorder. Memory.
4. Step 4. Flight recorder — is part of — Jet airliner. Flight recorders.
5. Step 5. Jet airliner — has part — Radar. A weather radar.

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