context: Chances are slight that Julius is a rhino. We believe that Lily is a swan. There is almost no chance that Sandra dropped the apple. It is probably the case that if either Lily is a swan, or Sandra dropped the apple, then Mary went to the office. It is highly likely that if Sandra dropped the apple, and Lily is a swan, then Brian is a frog. It is highly likely that if Sandra dropped the apple, or Lily is a swan, then Bernhard is a lion.
hypothesis: It is probably not the case that either Mary went to the office, or Lily is a swan.
valid_hypothesis: It is probably not the case that either Mary went to the office, or Lily is a swan.
invalid_hypothesis: It is highly likely that either Mary went to the office, or Lily is a swan.
hypothesis_assertion: Either Mary went to the office, or Lily is a swan.