context: It is highly likely that Julius is a frog. It is probably the case that Lily is a swan. Chances are slight that John went to the garden. It is probably not the case that if Lily is a swan, or Julius is a frog, then Sandra dropped the milk. It is probably the case that if Julius is a frog, or John went to the garden, then Brian is green. It is improbable that if Lily is a swan, or John went to the garden, then Jessica is a cat.
hypothesis: Chances are about even that either Brian is green, or Lily is a swan.
valid_hypothesis: Chances are about even that either Brian is green, or Lily is a swan.
invalid_hypothesis: There is almost no chance that either Brian is green, or Lily is a swan.
hypothesis_assertion: Either Brian is green, or Lily is a swan.