context: It is probably the case that Brian is a swan. It is almost certain that Julius is white. There is a better than even chance that Greg is a frog. Chances are slight that if Julius is white, and Brian is a swan, then Fred is in the bedroom. It is almost certain that if either Brian is a swan, or Greg is a frog, then Mary moved to the office. It is probably the case that if either Greg is a frog, or Brian is a swan, then John got the apple.
hypothesis: It is probably not the case that brian is a swan, and Mary moved to the office.
valid_hypothesis: It is probably not the case that brian is a swan, and Mary moved to the office.
invalid_hypothesis: It is probable that brian is a swan, and Mary moved to the office.
hypothesis_assertion: Brian is a swan, and Mary moved to the office.