context: Chances are about even that John went to the garden. It is probable that Bernhard is a swan. There is almost no chance that Mary picked up the milk.
hypothesis: It is probable that either Mary picked up the milk, or Bernhard is a swan.
valid_hypothesis: It is probable that either Mary picked up the milk, or Bernhard is a swan.
invalid_hypothesis: It is highly unlikely that either Mary picked up the milk, or Bernhard is a swan.
hypothesis_assertion: Either Mary picked up the milk, or Bernhard is a swan.