context: It is likely that Brian is green. Chances are slight that Greg is yellow. It is probable that Bernhard is a swan. Chances are slight that if either Greg is yellow, or Bernhard is a swan, then John got the football. It is impossible that if Greg is yellow, or Bernhard is a swan, then Mary went to the garden. It is highly unlikely that if Greg is yellow, and Brian is green, then Lily is a frog.
hypothesis: It is highly unlikely that either Mary went to the garden, or Bernhard is a swan.
valid_hypothesis: It is likely that either Mary went to the garden, or Bernhard is a swan.
invalid_hypothesis: It is highly unlikely that either Mary went to the garden, or Bernhard is a swan.
hypothesis_assertion: Either Mary went to the garden, or Bernhard is a swan.