String vibration and internal combustion engine: what they have in common

1. Step 1. String vibration — is a kind of — Wave theory. Standing waves.
2. Step 2. Wave theory — uses — Sound wave. Sound is a wave.
3. Step 3. Sound wave — is used in — Silencer. It damps sound waves.
4. Step 4. Silencer — is part of — Internal combustion engine. A silencer.

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