Command line and atomic clock: what they have in common

1. Step 1. Command line — evolved from — Typewriter. The teletype was a printing terminal.
2. Step 2. Typewriter — has part — Keyboard. The keys drive levers with type.
3. Step 3. Keyboard — is part of — Synthesizer. A keyboard.
4. Step 4. Synthesizer — has part — Oscillator. Sound oscillators.
5. Step 5. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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