Hair dryer and submarine: what they have in common

1. Step 1. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
2. Step 2. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.
3. Step 3. Electric fan — has part — Propeller. The blades.
4. Step 4. Propeller — is part of — Submarine. A propeller.

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