context: the man in jeans is sitting by the river with large fish.
hypothesis: It is impossible that a man in jeans is sitting by a river with large koi fish.
valid_hypothesis: It is impossible that a man in jeans is sitting by a river with large koi fish.
invalid_hypothesis: It is highly likely that a man in jeans is sitting by a river with large koi fish.
hypothesis_assertion: A man in jeans is sitting by a river with large koi fish.