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a+b=2,a-b=2,b+c=6,d+e=4,d-e=-4,e+f=4,g+h=6,g-h=6,h+i=2
a+b=2,a-b=2,b+c=6,d+e=4,d-e=-4,e+f=4,g+h=6,g-h=6,h+i=2
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