context: There is almost no chance that Sandra dropped the apple. It is probably the case that Julius is a swan. It is almost certain that John went to the hallway. It is likely that if either Julius is a swan, or Sandra dropped the apple, then Bernhard is green. Chances are about even that if either John went to the hallway, or Julius is a swan, then Brian is green. There is a very good chance that if Sandra dropped the apple, and Julius is a swan, then Fred left the football.
hypothesis: There is a very good chance that either Julius is a swan, or Brian is green.
valid_hypothesis: There is a very good chance that either Julius is a swan, or Brian is green.
invalid_hypothesis: It is probably not the case that either Julius is a swan, or Brian is green.
hypothesis_assertion: Either Julius is a swan, or Brian is green.