context: We doubt that Greg is a lion. It is highly likely that Julius is a swan. Chances are slight that John dropped the apple. There is almost no chance that if Julius is a swan, and John dropped the apple, then Mary went to the hallway. It is improbable that if John dropped the apple, or Greg is a lion, then Brian is gray. It is probably the case that if Julius is a swan, or Greg is a lion, then Sandra took the milk.
hypothesis: There is almost no chance that greg is a lion, and John dropped the apple.
valid_hypothesis: There is almost no chance that greg is a lion, and John dropped the apple.
invalid_hypothesis: There is a better than even chance that greg is a lion, and John dropped the apple.
hypothesis_assertion: Greg is a lion, and John dropped the apple.