context: It is highly unlikely that Bernhard is a frog. Chances are about even that Mary went to the office. We believe that Brian is a swan. It is almost certain that if Brian is a swan, or Bernhard is a frog, then John picked up the milk. It is certain that if Mary went to the office, or Brian is a swan, then Lily is a frog. It is improbable that if Brian is a swan, and Mary went to the office, then Jason is hungry.
hypothesis: Chances are about even that either Mary went to the office, or Bernhard is a frog.
valid_hypothesis: Chances are about even that either Mary went to the office, or Bernhard is a frog.
invalid_hypothesis: It is impossible that either Mary went to the office, or Bernhard is a frog.
hypothesis_assertion: Either Mary went to the office, or Bernhard is a frog.