context: It is likely that Greg is yellow. There is a very good chance that Bernhard is white. Chances are about even that Jessica is a cat. It is highly unlikely that if Bernhard is white, and Greg is yellow, then John went to the office. It is probable that if Jessica is a cat, and Greg is yellow, then Julius is a rhino. Chances are about even that if either Greg is yellow, or Bernhard is white, then Mary got the football.
hypothesis: We believe that either John went to the office, or Bernhard is white.
valid_hypothesis: We believe that either John went to the office, or Bernhard is white.
invalid_hypothesis: It is probably not the case that either John went to the office, or Bernhard is white.
hypothesis_assertion: Either John went to the office, or Bernhard is white.