context: Chances are slight that Mary went to the garden. It is improbable that Bernhard is a lion. It is probably the case that Brian is green. It is highly likely that if Mary went to the garden, and Brian is green, then Greg is white. There is a very good chance that if either Brian is green, or Mary went to the garden, then John picked up the apple. It is highly unlikely that if Mary went to the garden, and Brian is green, then Sandra left the milk.
hypothesis: It is impossible that sandra left the milk, and Greg is white.
valid_hypothesis: It is impossible that sandra left the milk, and Greg is white.
invalid_hypothesis: It is almost certain that sandra left the milk, and Greg is white.
hypothesis_assertion: Sandra left the milk, and Greg is white.