Electronic ink and headphones: what they have in common

1. Step 1. Electronic ink — is part of — E-reader. An electronic ink screen.
2. Step 2. E-reader — has part — Flash memory. Memory.
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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