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how to prove 

$(x^{*}y)^{*}x^{*}y = x^{*}(yx^{*})^{*}y$

I have already checked https://gateoverflow.in/290653/me_test_series?show=290690

It contains extra y.

x*y(yx*)*y

and I am not able to solve this , please help

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