Consider five individuals with different occupations. 
In a barter system which of the following pairs has a double coincidence of wants?
Definitions:
MS
Multiple Sclerosis, a disease in which the immune system eats away at the protective covering of nerves, disturbing the communication between the brain and the rest of the body.
Shoulder
A joint that connects the arm to the torso, consisting of several bones, muscles, and a complex range of motions, making it one of the most mobile joints in the body.
Abbreviation
A cut-down version of a word or phrase.
Calcium
A mineral essential for various body functions, including bone formation, muscle contraction, and blood clotting.
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