context: Two children are with a dog on leash who is standing against a tree.
hypothesis: It is impossible that two children are with a cat on leash who is standing against a tree.
valid_hypothesis: It is impossible that two children are with a cat on leash who is standing against a tree.
invalid_hypothesis: There is a better than even chance that two children are with a cat on leash who is standing against a tree.
hypothesis_assertion: Two children are with a cat on leash who is standing against a tree.