Cryptography and headphones: what they have in common

1. Step 1. Cryptography — is used in — Enigma. A cipher machine.
2. Step 2. Enigma — has part — Keyboard. A keyboard.
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 — Audiometer. A tone generator.
6. Step 6. Audiometer — has part — Headphones. Headphones.

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