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    7+c+9+6+9+5+c+b+2+3+a+7+1+d+8+5+1+6+8+8+c+c+0+d+7-f*8-b+1*0-7*2
    7-c-9-6-9-5-c-b-2-3-a-7-1-d-8-5-1-6-8-8-c-c-0+d*7+f*8-b*1+0-7+2
    7*c*9*6*9*5*c*b*2*3*a*7*1*d*8*5*1*6*8*8*c*c*0*d-7+f+8+b+1-0+7*2
    7*c*9*6*9*5*c*b*2*3*a*7*1*d*8*5*1*6*8*8/c/c*0-d+7+f+8+b-1*0+7*2

#!/usr/local/bin/perl

...
          if eval "$last_term % $first == 0";
    }
}