context: It is improbable that Fred went to the garden. There is a very good chance that Greg is a swan. We doubt that Emily is a sheep.
hypothesis: There is a very good chance that fred went to the garden, and Emily is a sheep.
valid_hypothesis: There is almost no chance that fred went to the garden, and Emily is a sheep.
invalid_hypothesis: There is a very good chance that fred went to the garden, and Emily is a sheep.
hypothesis_assertion: Fred went to the garden, and Emily is a sheep.