Electromyography and gas lamp: what they have in common

1. Step 1. Electromyography — has part — Amplifier. An amplifier.
2. Step 2. Amplifier — is part of — Public address system. Amplifiers.
3. Step 3. Public address system — is part of — Stadium. Sound.
4. Step 4. Stadium — has part — Street light. Floodlights.
5. Step 5. Street light — evolved from — Gas lamp. Gas lamps.

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