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$$\prod_{i=0}^{n-1} (1+q^iz) = \sum_{i=0}^n q^{i(i-1)/2}\binom ni_q z^i$$
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玉皇爷爷也姓张，为啥为难俺张宗昌？三天之内不下雨，先扒龙皇庙，再用大炮轰你娘。
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向上，不是向北
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