Halloween
B: Go to a party with my friends
D: Hang out with my friends on Halloween
A: I will be happy
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C: Keep my mom happy
D': Take my brother and sister Trick or Treating
In order to I will be happy I must Go to a party with my friends and in order to Go to a party with my friends I must Hang out with my friends on Halloween. But, in order to I will be happy I must also Keep my mom happy and in order to Keep my mom happy I must Take my brother and sister Trick or Treating. I can't both Hang out with my friends on Halloween and Take my brother and sister Trick or Treating.
| Relation | Assumption(s) | Injection(s) |