Ocean liner and saw: what they have in common

1. Step 1. Ocean liner — has part — Turbine. Large liners run on steam turbines.
2. Step 2. Turbine — evolved from — Water wheel. The water turbine evolved from the water wheel.
3. Step 3. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
4. Step 4. Sawmill — uses — Saw. The cutting tool is a saw.

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