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c=b-a, d=c/b, e=d-c, f=e/d, g=f-e, h=g/f, i=h-g, j=i/h, s=a+b+c+d+e+f+g+h
c=b-a, d=c/b, e=d-c, f=e/d, g=f-e, h=g/f, i=h-g, j=i/h, s=a+b+c+d+e+f+g+h
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