context: Chances are about even that Brian is a rhino. It is highly unlikely that Bernhard is gray. We believe that Mary went to the garden.
hypothesis: We believe that either Mary went to the garden, or Bernhard is gray.
valid_hypothesis: We believe that either Mary went to the garden, or Bernhard is gray.
invalid_hypothesis: It is impossible that either Mary went to the garden, or Bernhard is gray.
hypothesis_assertion: Either Mary went to the garden, or Bernhard is gray.