context: It is certain that Lily is a frog. It is probably not the case that Bernhard is yellow. Chances are slight that Fred is in the school. It is highly unlikely that if Lily is a frog, or Fred is in the school, then Sandra grabbed the milk. It is highly unlikely that if Bernhard is yellow, and Lily is a frog, then Mary went to the office. There is almost no chance that if either Bernhard is yellow, or Lily is a frog, then Julius is gray.
hypothesis: It is almost certain that fred is in the school, and Lily is a frog.
valid_hypothesis: There is little chance that fred is in the school, and Lily is a frog.
invalid_hypothesis: It is almost certain that fred is in the school, and Lily is a frog.
hypothesis_assertion: Fred is in the school, and Lily is a frog.