tv program vs study

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the conflict is wether or not i should watch a tv program or study for an up and coming exam.

D: study for my exam
D': spend time with my family
B: pass my exam
C: have quality time with my family
A: effectively use my time
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In order to effectively use my time I must pass my exam and in order to pass my exam I must study for my exam. But, in order to effectively use my time I must also have quality time with my family and in order to have quality time with my family I must spend time with my family. I can't both study for my exam and spend time with my family.
RelationAssumption(s)Injection(s)
B-Dto pass my exam requires study