Consider the following traders who meet. 
Which, if any, pairs of traders has a double coincidence of wants?
Definitions:
Incidence
The frequency or rate at which new cases of a condition, disease, or event occur in a specific population over a certain period.
Boomerang Kids
Young adults who move back into their parents’ homes after an initial period of independent living.
Attention Deficit
A disorder characterized by patterns of inattention, impulsiveness, and sometimes hyperactivity that interfere with functioning or development.
Hyperactivity Disorder
A condition characterized by excessive restlessness and activity, often diagnosed as Attention Deficit Hyperactivity Disorder (ADHD).
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