Consider the following traders who meet. 
Which, if any, pairs of traders has a double coincidence of wants?
Definitions:
Blood Flow
The continuous circulation of blood through the heart and blood vessels, delivering oxygen and nutrients to the body while removing waste products.
Major Depression
A psychiatric disorder marked by significant and persistent feelings of sadness and despair, affecting daily functioning.
Antidepressant
Medications designed to alleviate symptoms of depression by adjusting chemical imbalances in the brain.
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