context: Chances are slight that Sandra dropped the milk. There is almost no chance that Greg is yellow. It is probably not the case that Fred moved to the office. It is highly unlikely that if Fred moved to the office, and Sandra dropped the milk, then Julius is a frog. There is a very good chance that if Fred moved to the office, or Greg is yellow, then Lily is white. There is almost no chance that if Greg is yellow, and Sandra dropped the milk, then Mary went to the kitchen.
hypothesis: It is highly unlikely that either Lily is white, or Fred moved to the office.
valid_hypothesis: It is highly unlikely that either Lily is white, or Fred moved to the office.
invalid_hypothesis: It is certain that either Lily is white, or Fred moved to the office.
hypothesis_assertion: Either Lily is white, or Fred moved to the office.