Flute and submarine: what they have in common

1. Step 1. Flute — uses — Sound wave. Sound.
2. Step 2. Sound wave — is used in — Echo sounder. A sound pulse.
3. Step 3. Echo sounder — evolved into — Sonar. Echolocation.
4. Step 4. Sonar — is part of — Submarine. Underwater acoustics.

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