Factor the expression as the sum or difference of two cubes. 
Definitions:
Fluid
A substance that flows freely, such as a liquid or gas, adjusting its shape to fit its container.
Eupnea
Normal, unlabored breathing.
Breathing Difficulty
A sensation of not being able to breathe well or feeling suffocated, which can be a symptom of various medical conditions.
Pneumoconiosis
A type of lung disease caused by the inhalation of dust, leading to inflammation and scarring of the lung tissue.
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