MIDI and barrel: what they have in common

1. Step 1. MIDI — is used in — Synthesizer. MIDI.
2. Step 2. Synthesizer — has part — Oscillator. Sound oscillators.
3. Step 3. Oscillator — has part — Inductor. An LC circuit.
4. Step 4. Inductor — is made of — Iron. The core is iron.
5. Step 5. Iron — is material for — Barrel. The staves are bound with iron hoops.

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