context: It is certain that John left the football. It is probably the case that Julius is green. It is highly unlikely that Greg is yellow.
hypothesis: It is certain that greg is yellow, or John left the football.
valid_hypothesis: It is certain that greg is yellow, or John left the football.
invalid_hypothesis: Chances are about even that greg is yellow, or John left the football.
hypothesis_assertion: Greg is yellow, or John left the football.