context: It is almost certain that Greg is a rhino. It is likely that Lily is gray. There is a better than even chance that John took the apple. It is impossible that if Lily is gray, or John took the apple, then Brian is a lion. It is certain that if Greg is a rhino, and John took the apple, then Mary went to the kitchen. It is probably not the case that if either Greg is a rhino, or Lily is gray, then Bernhard is a swan.
hypothesis: We believe that either Lily is gray, or Bernhard is a swan.
valid_hypothesis: We believe that either Lily is gray, or Bernhard is a swan.
invalid_hypothesis: There is almost no chance that either Lily is gray, or Bernhard is a swan.
hypothesis_assertion: Either Lily is gray, or Bernhard is a swan.