Strings and electric motor: what they have in common

1. Step 1. Strings — is part of — Guitar. Six strings.
2. Step 2. Guitar — evolved into — Electric guitar. Electrification.
3. Step 3. Electric guitar — has part — Potentiometer. The volume and tone knobs on an electric guitar are potentiometers.
4. Step 4. Potentiometer — is part of — Perceptron. Potentiometers set the weights.
5. Step 5. Perceptron — has part — Electric motor. Motors adjusted the weights during training.

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