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root 1-x2 + root 1-y2 a x-y
if 1u root x 2+y 2+z 2
if x root 2+1root 2-1
if y root 1-x1+x
y x+root x 2-1 2
if 2 x+y 2 x-y root 8
if root x+y + root y-x
if y x+root 1+x 2 n
x root 1+y +y root 1+x
if x 2+root 3 and xy 1
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