context: We doubt that John went to the kitchen. It is likely that Mary moved to the garden. Chances are about even that Jessica is a cat. We believe that if Jessica is a cat, and John went to the kitchen, then Julius is gray. Chances are slight that if either Mary moved to the garden, or John went to the kitchen, then Greg is green. We doubt that if Jessica is a cat, or John went to the kitchen, then Jeff dropped the apple.
hypothesis: It is probably not the case that either John went to the kitchen, or Greg is green.
valid_hypothesis: It is probably not the case that either John went to the kitchen, or Greg is green.
invalid_hypothesis: It is likely that either John went to the kitchen, or Greg is green.
hypothesis_assertion: Either John went to the kitchen, or Greg is green.