Harmonica comb and programmable logic controller: what they have in common

1. Step 1. Harmonica comb — is part of — Harmonica. Air channels.
2. Step 2. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
3. Step 3. Accordion — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Personal computer. A keyboard.
5. Step 5. Personal computer — has part — Microprocessor. The PC became possible thanks to the microprocessor.
6. Step 6. Microprocessor — is part of — Programmable logic controller. A processor.

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