context: We believe that Julius is a lion. Chances are slight that Winona is a mouse. There is almost no chance that Mary went to the office. It is impossible that if Mary went to the office, or Winona is a mouse, then Lily is white. There is a better than even chance that if Mary went to the office, and Winona is a mouse, then Greg is a lion. There is little chance that if Mary went to the office, or Julius is a lion, then Brian is gray.
hypothesis: There is little chance that either Brian is gray, or Mary went to the office.
valid_hypothesis: There is little chance that either Brian is gray, or Mary went to the office.
invalid_hypothesis: There is a better than even chance that either Brian is gray, or Mary went to the office.
hypothesis_assertion: Either Brian is gray, or Mary went to the office.