context: There is almost no chance that Gertrude is a mouse. It is improbable that John left the football. It is probably the case that Greg is yellow. There is a very good chance that if Greg is yellow, and Gertrude is a mouse, then Julius is a rhino. Chances are slight that if either John left the football, or Greg is yellow, then Bill is in the kitchen. There is a very good chance that if Greg is yellow, or John left the football, then Mary went to the garden.
hypothesis: It is improbable that either Greg is yellow, or Julius is a rhino.
valid_hypothesis: It is likely that either Greg is yellow, or Julius is a rhino.
invalid_hypothesis: It is improbable that either Greg is yellow, or Julius is a rhino.
hypothesis_assertion: Either Greg is yellow, or Julius is a rhino.