context: It is almost certain that Lily is a lion. It is highly unlikely that Brian is a swan. There is little chance that Mary went to the garden. There is a better than even chance that if Mary went to the garden, and Brian is a swan, then John picked up the milk. Chances are slight that if either Lily is a lion, or Mary went to the garden, then Julius is a rhino. There is little chance that if Lily is a lion, and Brian is a swan, then Emily is a cat.
hypothesis: It is impossible that either Emily is a cat, or John picked up the milk.
valid_hypothesis: It is impossible that either Emily is a cat, or John picked up the milk.
invalid_hypothesis: We believe that either Emily is a cat, or John picked up the milk.
hypothesis_assertion: Either Emily is a cat, or John picked up the milk.