Using the matrices A and B below, what condition must be satisfied in order that AB and BA are defined? 
and 
Definitions:
Medical History
A comprehensive record of a patient's past and ongoing health conditions, treatments, allergies, and outcomes.
Chest Pain
A discomfort or pain that is felt anywhere along the front of the body between the neck and the upper abdomen.
Family History
Information about health conditions and diseases that occur in a person's family, used to identify potential health risks for individuals.
Hospital
A healthcare institution providing patient treatment with specialized medical and nursing staff and medical equipment.
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