context: Chances are slight that Jessica is a sheep. We doubt that Mary got the football. There is a very good chance that Bernhard is a frog. There is a very good chance that if either Jessica is a sheep, or Mary got the football, then Gertrude is a mouse. It is impossible that if Jessica is a sheep, or Bernhard is a frog, then Brian is a swan. It is certain that if either Jessica is a sheep, or Bernhard is a frog, then Julius is yellow.
hypothesis: There is a very good chance that brian is a swan, or Bernhard is a frog.
valid_hypothesis: There is a very good chance that brian is a swan, or Bernhard is a frog.
invalid_hypothesis: It is improbable that brian is a swan, or Bernhard is a frog.
hypothesis_assertion: Brian is a swan, or Bernhard is a frog.