context: It is improbable that Julius is a frog. We doubt that Lily is white. It is probably not the case that John grabbed the milk.
hypothesis: We believe that julius is a frog, and Lily is white.
valid_hypothesis: There is almost no chance that julius is a frog, and Lily is white.
invalid_hypothesis: We believe that julius is a frog, and Lily is white.
hypothesis_assertion: Julius is a frog, and Lily is white.