Zhang San asked Li Si: "Do you often watch" Xinhua Digest "?" Li Si replied: "Who says I don't watch" Xinhua Digest "often?" Zhang San asked Li Si: "So you often watch" Xinhua Digest " "" Li Si replied: I'm not saying that I often watch Xinhua Digest. ". Judging from the perspective of logical laws, Li Si's answer? ['Violation of the law of contradiction.', 'Violation of the law of the middle row.', 'Violation of both the law of contradiction and the law of exclusion.', 'Neither the law of contradiction nor the law of exclusion is violated.']