context: It is highly likely that Jeff went to the kitchen. It is probable that Daniel got the milk. We believe that Greg is white. It is impossible that if either Greg is white, or Jeff went to the kitchen, then Brian is yellow. Chances are about even that if Greg is white, or Jeff went to the kitchen, then John moved to the garden. It is improbable that if Greg is white, or Daniel got the milk, then Bernhard is a lion.
hypothesis: We believe that greg is white, or Brian is yellow.
valid_hypothesis: We believe that greg is white, or Brian is yellow.
invalid_hypothesis: We doubt that greg is white, or Brian is yellow.
hypothesis_assertion: Greg is white, or Brian is yellow.