context: Chances are slight that Greg is a lion. Chances are slight that Julius is a rhino. It is impossible that Winona is a mouse. It is highly unlikely that if Greg is a lion, or Julius is a rhino, then Mary moved to the office. It is highly unlikely that if either Winona is a mouse, or Julius is a rhino, then Brian is a frog. It is certain that if Winona is a mouse, and Greg is a lion, then John left the apple.
hypothesis: We believe that either Greg is a lion, or Brian is a frog.
valid_hypothesis: There is little chance that either Greg is a lion, or Brian is a frog.
invalid_hypothesis: We believe that either Greg is a lion, or Brian is a frog.
hypothesis_assertion: Either Greg is a lion, or Brian is a frog.