context: It is probable that Daniel left the apple. It is impossible that John went to the hallway. We believe that Sandra grabbed the milk. Chances are about even that if Daniel left the apple, or Sandra grabbed the milk, then Brian is a frog. It is certain that if John went to the hallway, or Sandra grabbed the milk, then Mary moved to the office. It is certain that if Daniel left the apple, or John went to the hallway, then Jessica is a sheep.
hypothesis: Chances are about even that either Brian is a frog, or Sandra grabbed the milk.
valid_hypothesis: Chances are about even that either Brian is a frog, or Sandra grabbed the milk.
invalid_hypothesis: It is certain that either Brian is a frog, or Sandra grabbed the milk.
hypothesis_assertion: Either Brian is a frog, or Sandra grabbed the milk.