context: It is highly likely that Lily is a rhino. It is probable that Greg is green. It is likely that John left the football.
hypothesis: Chances are about even that either John left the football, or Greg is green.
valid_hypothesis: Chances are about even that either John left the football, or Greg is green.
invalid_hypothesis: It is impossible that either John left the football, or Greg is green.
hypothesis_assertion: Either John left the football, or Greg is green.