{-1, -1, -1, 1}.({1, 2, 0, -2}-x*{1, 1, 1, 1}-y*{-1, -1, -1, 1})=0, {1, 1, 1, 1}.({1, 2, 0, -2}-x*{1, 1, 1, 1}-y*{-1, -1, -1, 1})=0

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