context: It is unlikely that Mary got the milk. Chances are slight that Greg is a frog. There is little chance that Julius is a swan. It is probably the case that if Mary got the milk, and Julius is a swan, then Lily is gray. It is impossible that if Greg is a frog, or Mary got the milk, then John went to the garden. It is improbable that if either Mary got the milk, or Greg is a frog, then Bernhard is white.
hypothesis: It is likely that either Greg is a frog, or Mary got the milk.
valid_hypothesis: It is probably not the case that either Greg is a frog, or Mary got the milk.
invalid_hypothesis: It is likely that either Greg is a frog, or Mary got the milk.
hypothesis_assertion: Either Greg is a frog, or Mary got the milk.