context: It is probably the case that Bernhard is a lion. Chances are slight that Brian is green. There is little chance that Greg is a swan. It is highly unlikely that if either Bernhard is a lion, or Greg is a swan, then Julius is yellow. Chances are about even that if Brian is green, and Bernhard is a lion, then John went to the office. It is probably the case that if either Brian is green, or Greg is a swan, then Daniel dropped the milk.
hypothesis: It is almost certain that greg is a swan, or Brian is green.
valid_hypothesis: We doubt that greg is a swan, or Brian is green.
invalid_hypothesis: It is almost certain that greg is a swan, or Brian is green.
hypothesis_assertion: Greg is a swan, or Brian is green.