context: We believe that Jeff went to the kitchen. It is probable that Greg is a lion. There is a better than even chance that Brian is a frog. There is a very good chance that if Greg is a lion, or Jeff went to the kitchen, then Julius is a swan. There is almost no chance that if Jeff went to the kitchen, or Greg is a lion, then Lily is a rhino. Chances are about even that if Jeff went to the kitchen, and Greg is a lion, then Mary picked up the milk.
hypothesis: It is probably not the case that either Mary picked up the milk, or Lily is a rhino.
valid_hypothesis: It is probably not the case that either Mary picked up the milk, or Lily is a rhino.
invalid_hypothesis: It is almost certain that either Mary picked up the milk, or Lily is a rhino.
hypothesis_assertion: Either Mary picked up the milk, or Lily is a rhino.