tv program vs study
B: pass my exam
D: study for my exam
A: effectively use my time
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C: have quality time with my family
D': spend time with my family
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.
| Relation | Assumption(s) | Injection(s) |
| B-D | to pass my exam requires study |