context: We doubt that Lily is a swan. It is certain that John went to the garden. We believe that Sandra got the milk. We believe that if either Sandra got the milk, or John went to the garden, then Gertrude is a mouse. Chances are about even that if Lily is a swan, or Sandra got the milk, then Mary dropped the apple. There is almost no chance that if either John went to the garden, or Sandra got the milk, then Brian is white.
hypothesis: There is a very good chance that lily is a swan, or Sandra got the milk.
valid_hypothesis: There is a very good chance that lily is a swan, or Sandra got the milk.
invalid_hypothesis: There is almost no chance that lily is a swan, or Sandra got the milk.
hypothesis_assertion: Lily is a swan, or Sandra got the milk.