context: It is probable that Mary is in the school. We believe that Brian is a lion. There is little chance that Sumit is bored. It is probably the case that if Mary is in the school, or Sumit is bored, then Greg is green. It is almost certain that if Sumit is bored, and Mary is in the school, then John discarded the milk. Chances are slight that if either Brian is a lion, or Sumit is bored, then Julius is a rhino.
hypothesis: Chances are about even that either Brian is a lion, or Mary is in the school.
valid_hypothesis: Chances are about even that either Brian is a lion, or Mary is in the school.
invalid_hypothesis: It is impossible that either Brian is a lion, or Mary is in the school.
hypothesis_assertion: Either Brian is a lion, or Mary is in the school.