context: We believe that Lily is white. Chances are about even that Sandra took the football. There is a very good chance that Bernhard is a swan.
hypothesis: It is certain that either Sandra took the football, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either Sandra took the football, or Bernhard is a swan.
invalid_hypothesis: It is certain that either Sandra took the football, or Bernhard is a swan.
hypothesis_assertion: Either Sandra took the football, or Bernhard is a swan.