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Besides being a Contrast and Contradiction, what other Sign Post is being used and how do you know:
"I could have gotten mad again at the whole mail thing, but I didn't have the energy or the interest anymore...I couldn't change him or the fact that he was my father. All I could do is try not to become him."
Aha Moment - Peak is realizing a lesson that he learned from the experience, which is that he can't control/change others so there's no point in wasting energy getting upset over things that are outside of his control