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(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
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(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
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(y+x)(y-x)
(x+y)(x+y)
(x+y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
(x-y)(x-y)
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(x+y)(x-y)
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(x+y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
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(x+y)(x+y)
(x+y)(x-y)
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