context: It is certain that Jeff dropped the apple. Chances are slight that Bernhard is a lion. It is improbable that Mary went to the garden. It is probably not the case that if Jeff dropped the apple, and Mary went to the garden, then Fred is in the office. It is likely that if Jeff dropped the apple, or Mary went to the garden, then Julius is a rhino. It is probably not the case that if Bernhard is a lion, or Jeff dropped the apple, then Lily is a lion.
hypothesis: It is probable that either Julius is a rhino, or Bernhard is a lion.
valid_hypothesis: It is probable that either Julius is a rhino, or Bernhard is a lion.
invalid_hypothesis: There is almost no chance that either Julius is a rhino, or Bernhard is a lion.
hypothesis_assertion: Either Julius is a rhino, or Bernhard is a lion.