context: It is highly unlikely that John went to the garden. There is a better than even chance that Sandra left the apple. It is unlikely that Greg is a lion. It is impossible that if Greg is a lion, and John went to the garden, then Brian is a rhino. There is little chance that if either John went to the garden, or Greg is a lion, then Julius is white. It is probably not the case that if Sandra left the apple, and John went to the garden, then Mary is in the school.
hypothesis: There is a very good chance that greg is a lion, or Mary is in the school.
valid_hypothesis: We doubt that greg is a lion, or Mary is in the school.
invalid_hypothesis: There is a very good chance that greg is a lion, or Mary is in the school.
hypothesis_assertion: Greg is a lion, or Mary is in the school.