context: We believe that Greg is a swan. Chances are about even that John went to the kitchen. It is improbable that Sandra got the football. There is almost no chance that if John went to the kitchen, or Sandra got the football, then Bill moved to the garden. It is probably the case that if Greg is a swan, or John went to the kitchen, then Julius is a rhino. We believe that if John went to the kitchen, and Sandra got the football, then Lily is a frog.
hypothesis: There is almost no chance that either Sandra got the football, or Julius is a rhino.
valid_hypothesis: There is a better than even chance that either Sandra got the football, or Julius is a rhino.
invalid_hypothesis: There is almost no chance that either Sandra got the football, or Julius is a rhino.
hypothesis_assertion: Either Sandra got the football, or Julius is a rhino.