context: Chances are about even that Mary went to the kitchen. It is probable that Brian is a lion. There is little chance that Bernhard is a swan. Chances are slight that if Mary went to the kitchen, and Bernhard is a swan, then Greg is a frog. It is impossible that if Bernhard is a swan, or Mary went to the kitchen, then Julius is a rhino. It is probably not the case that if either Mary went to the kitchen, or Brian is a lion, then John picked up the milk.
hypothesis: There is a very good chance that mary went to the kitchen, and Julius is a rhino.
valid_hypothesis: It is impossible that mary went to the kitchen, and Julius is a rhino.
invalid_hypothesis: There is a very good chance that mary went to the kitchen, and Julius is a rhino.
hypothesis_assertion: Mary went to the kitchen, and Julius is a rhino.