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  Answer 2.  Calculate differences.  
  
      u = -1;
      for (i=0;i<81;i++)
      {
        if (i%9 == 0) q(2,"\n");
        u++;
        if (i% 3 == 0) u +=   6;
        if (i% 9 == 0) u += -24;
        if (i%27 == 0) u +=  18;
        fprintf(fout," %3d ",u);
      }

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