Flute and aeroplane: what they have in common

1. Step 1. Flute — uses — Sound wave. Sound.
2. Step 2. Sound wave — is used in — Silencer. It damps sound waves.
3. Step 3. Silencer — is part of — Internal combustion engine. A silencer.
4. Step 4. Internal combustion engine — is part of — Aeroplane. Piston aero engines.

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