Factor the expression as the sum or difference of two cubes. 
Definitions:
Pedal Pulses
Pulses felt at the feet, specifically the dorsalis pedis and posterior tibial arteries, indicative of blood circulation to the area.
Chronic Obstructive Pulmonary Disease
A long-term lung disease characterized by obstructed airflow from the lungs, leading to breathing difficulties.
Clubbed Shape
A term describing the bulbous enlargement of the ends of fingers or toes, often indicative of chronic oxygen deficiency or various diseases.
Rounded Chest
A physical condition, often congenital, where the chest appears more circular or barrel-shaped than usual.
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