context: We believe that Greg is a frog. There is a better than even chance that Mary put down the milk. Chances are slight that Gertrude is a mouse. There is a very good chance that if Greg is a frog, and Gertrude is a mouse, then Julie is in the office. Chances are slight that if either Greg is a frog, or Gertrude is a mouse, then Lily is a swan. It is highly likely that if Gertrude is a mouse, and Mary put down the milk, then Jeff discarded the milk.
hypothesis: Chances are about even that jeff discarded the milk, and Julie is in the office.
valid_hypothesis: There is almost no chance that jeff discarded the milk, and Julie is in the office.
invalid_hypothesis: Chances are about even that jeff discarded the milk, and Julie is in the office.
hypothesis_assertion: Jeff discarded the milk, and Julie is in the office.