Paddle wheel and saw: what they have in common

1. Step 1. Paddle wheel — works like — Water wheel. A water wheel in reverse: instead of water turning the wheel, the wheel pushes the water.
2. Step 2. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
3. Step 3. Sawmill — uses — Saw. The cutting tool is a saw.

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