context: It is highly unlikely that Sandra left the football. Chances are about even that Bernhard is a lion. It is probable that Emily is a cat. There is almost no chance that if Sandra left the football, and Bernhard is a lion, then Brian is a lion. It is impossible that if either Emily is a cat, or Bernhard is a lion, then Mary moved to the office. We believe that if Sandra left the football, or Bernhard is a lion, then Bill went to the garden.
hypothesis: It is likely that brian is a lion, or Emily is a cat.
valid_hypothesis: It is likely that brian is a lion, or Emily is a cat.
invalid_hypothesis: It is probably not the case that brian is a lion, or Emily is a cat.
hypothesis_assertion: Brian is a lion, or Emily is a cat.