Expand
x^{20}+167960x^{9}y^{11}+125970x^{8}y^{12}+77520x^{7}y^{13}+38760x^{6}y^{14}+15504x^{5}y^{15}+4845x^{4}y^{16}+1140x^{3}y^{17}+190x^{2}y^{18}+20xy^{19}+y^{20}+167960y^{9}x^{11}+125970y^{8}x^{12}+77520y^{7}x^{13}+38760y^{6}x^{14}+15504y^{5}x^{15}+4845y^{4}x^{16}+1140y^{3}x^{17}+190y^{2}x^{18}+20yx^{19}+184756\left(xy\right)^{10}
Evaluate
\left(x+y\right)^{20}
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