Lithotripsy and bicycle: what they have in common

1. Step 1. Lithotripsy — uses — Sound wave. A shock wave.
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 — Moped. A small-displacement combustion engine.
5. Step 5. Moped — evolved from — Bicycle. A bicycle with a motor.

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