context: Chances are about even that Lily is a lion. There is a very good chance that Sandra got the football. There is a very good chance that John went to the garden. We believe that if Sandra got the football, or John went to the garden, then Greg is a frog. It is certain that if Sandra got the football, and John went to the garden, then Julius is a swan. It is certain that if either Lily is a lion, or Sandra got the football, then Mary dropped the milk.
hypothesis: We believe that either John went to the garden, or Sandra got the football.
valid_hypothesis: It is probably not the case that either John went to the garden, or Sandra got the football.
invalid_hypothesis: We believe that either John went to the garden, or Sandra got the football.
hypothesis_assertion: Either John went to the garden, or Sandra got the football.