Harmonica and submarine: what they have in common

1. Step 1. Harmonica — works like — Accordion. Free-reed instruments; air comes from the lungs instead of bellows.
2. Step 2. Accordion — has part — Bellows. Bellows.
3. Step 3. Bellows — is made of — Leather. Bellows are a leather bag.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.

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