context: It is likely that Bernhard is a frog. Chances are slight that Lily is yellow. There is a better than even chance that Mary moved to the office. It is highly likely that if Bernhard is a frog, and Mary moved to the office, then Greg is gray. Chances are slight that if either Lily is yellow, or Mary moved to the office, then Sandra left the apple. It is almost certain that if Bernhard is a frog, and Lily is yellow, then Fred dropped the apple.
hypothesis: Chances are about even that sandra left the apple, and Mary moved to the office.
valid_hypothesis: It is highly unlikely that sandra left the apple, and Mary moved to the office.
invalid_hypothesis: Chances are about even that sandra left the apple, and Mary moved to the office.
hypothesis_assertion: Sandra left the apple, and Mary moved to the office.