context: Chances are about even that Greg is a swan. It is probably the case that John took the apple. It is impossible that Mary moved to the garden. There is a very good chance that if Greg is a swan, and John took the apple, then Brian is white. We believe that if Greg is a swan, and Mary moved to the garden, then Yann got the milk there. It is improbable that if Greg is a swan, or John took the apple, then Julius is a frog.
hypothesis: There is a better than even chance that either Julius is a frog, or John took the apple.
valid_hypothesis: There is a better than even chance that either Julius is a frog, or John took the apple.
invalid_hypothesis: It is improbable that either Julius is a frog, or John took the apple.
hypothesis_assertion: Either Julius is a frog, or John took the apple.