context: There is a very good chance that Greg is a frog. We doubt that Brian is a rhino. There is a better than even chance that John took the apple. There is a better than even chance that if John took the apple, and Greg is a frog, then Lily is a lion. Chances are slight that if John took the apple, and Brian is a rhino, then Mary went to the kitchen. We believe that if Brian is a rhino, or Greg is a frog, then Bill dropped the milk.
hypothesis: It is highly likely that john took the apple, or Bill dropped the milk.
valid_hypothesis: It is highly likely that john took the apple, or Bill dropped the milk.
invalid_hypothesis: It is probably not the case that john took the apple, or Bill dropped the milk.
hypothesis_assertion: John took the apple, or Bill dropped the milk.