context: Chances are slight that Fred moved to the office. We believe that Bernhard is yellow. There is a very good chance that Lily is a lion. It is highly unlikely that if Lily is a lion, and Fred moved to the office, then Sandra left the football. It is improbable that if either Lily is a lion, or Bernhard is yellow, then Greg is a frog. It is certain that if Bernhard is yellow, and Lily is a lion, then Mary got the milk.
hypothesis: There is almost no chance that greg is a frog, or Mary got the milk.
valid_hypothesis: There is a better than even chance that greg is a frog, or Mary got the milk.
invalid_hypothesis: There is almost no chance that greg is a frog, or Mary got the milk.
hypothesis_assertion: Greg is a frog, or Mary got the milk.