maximum of (((y-mu) e^(-(y-mu)^2/(2 sigma^2)))/(sqrt(2 pi) sigma^3)-((x-mu) e^(-(x-mu)^2/(2 sigma^2)))/(sqrt(2 pi) sigma^3))/(1/2 erfc((mu-x)/(sqrt(2) sigma))-1/2 erfc((mu-y)/(sqrt(2) sigma)))

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