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The roots of x2016−x2015+x2013−x2010+x2006−…−1=0x^{2016}-x^{2015}+x^{2013}-x^{2010}+x^{2006}-\ldots-1 = 0x2016−x2015+x2013−x2010+x2006−…−1=0 are r1,r2,…,r2016r_{1}, r_{2}, \ldots, r_{2016}r1,r2,…,r2016.
Find
∑1≤i<j≤2016rirj\sum_{1 \leq i < j \leq 2016} r_{i}r_{j}1≤i<j≤2016∑rirj
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