Smart speaker and typewriter: what they have in common

1. Step 1. Smart speaker — has part — Microphone. An array of microphones.
2. Step 2. Microphone — is part of — Mobile phone. A microphone.
3. Step 3. Mobile phone — has part — Keyboard. A numeric keypad.
4. Step 4. Keyboard — is part of — Typewriter. The keys drive levers with type.

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