Watermill and rocket: what they have in common

1. Step 1. Watermill — has part — Water wheel. A water wheel drives the mill’s mechanism.
2. Step 2. Water wheel — is part of — Gunpowder mill. The drive.
3. Step 3. Gunpowder mill — uses — Gunpowder. Production.
4. Step 4. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.

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