context: We believe that Julius is a swan. It is probably not the case that Sandra dropped the milk. It is certain that Mary is in the garden.
hypothesis: It is improbable that either Julius is a swan, or Sandra dropped the milk.
valid_hypothesis: There is a better than even chance that either Julius is a swan, or Sandra dropped the milk.
invalid_hypothesis: It is improbable that either Julius is a swan, or Sandra dropped the milk.
hypothesis_assertion: Either Julius is a swan, or Sandra dropped the milk.