-(p (p^2 (q^2 r + q (2 - 4 r) + 2 r - 1) - p (2 q^2 r - 6 q r + q + 2 r) + (q - 2) q r))/((p (q - 1) - q) (p (r - 1) - r) (p (q - 1) (r - 1) + q (-r) + q + r)) where p=1/2,q=4/5,r=1

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