context: It is certain that Bernhard is white. It is unlikely that Lily is white. Chances are slight that John got the apple. It is likely that if Bernhard is white, and John got the apple, then Brian is a swan. There is almost no chance that if either Lily is white, or Bernhard is white, then Mary took the milk. It is probably the case that if John got the apple, or Bernhard is white, then Emily is a mouse.
hypothesis: It is probably the case that either Brian is a swan, or Lily is white.
valid_hypothesis: It is probably not the case that either Brian is a swan, or Lily is white.
invalid_hypothesis: It is probably the case that either Brian is a swan, or Lily is white.
hypothesis_assertion: Either Brian is a swan, or Lily is white.