context: Chances are slight that Mary went to the hallway. There is almost no chance that John dropped the apple. Chances are slight that Greg is a frog. It is almost certain that if either Greg is a frog, or John dropped the apple, then Julius is yellow. Chances are about even that if Greg is a frog, or John dropped the apple, then Brian is a swan. It is probably not the case that if Greg is a frog, and Mary went to the hallway, then Lily is a rhino.
hypothesis: There is a very good chance that either Greg is a frog, or Mary went to the hallway.
valid_hypothesis: We doubt that either Greg is a frog, or Mary went to the hallway.
invalid_hypothesis: There is a very good chance that either Greg is a frog, or Mary went to the hallway.
hypothesis_assertion: Either Greg is a frog, or Mary went to the hallway.