context: It is probably not the case that Mary went to the hallway. Chances are about even that Bernhard is a rhino. There is almost no chance that Greg is a swan.
hypothesis: It is probably not the case that either Mary went to the hallway, or Greg is a swan.
valid_hypothesis: It is probably not the case that either Mary went to the hallway, or Greg is a swan.
invalid_hypothesis: It is highly likely that either Mary went to the hallway, or Greg is a swan.
hypothesis_assertion: Either Mary went to the hallway, or Greg is a swan.