Minicomputer and headphones: what they have in common

1. Step 1. Minicomputer — has part — Transistor. Transistor logic.
2. Step 2. Transistor — is part of — Flash memory. Each cell is a floating-gate transistor.
3. Step 3. Flash memory — is part of — MP3 player. Flash memory.
4. Step 4. MP3 player — has part — Headphones. Headphones.

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