context: Chances are about even that Lily is a swan. It is likely that John moved to the garden. It is unlikely that Mary is in the cinema. It is probably the case that if either Lily is a swan, or John moved to the garden, then Brian is green. It is highly unlikely that if Mary is in the cinema, or Lily is a swan, then Julius is a frog. It is improbable that if Mary is in the cinema, or Lily is a swan, then Bill dropped the milk.
hypothesis: Chances are about even that either Julius is a frog, or Lily is a swan.
valid_hypothesis: Chances are about even that either Julius is a frog, or Lily is a swan.
invalid_hypothesis: There is almost no chance that either Julius is a frog, or Lily is a swan.
hypothesis_assertion: Either Julius is a frog, or Lily is a swan.