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  Answer 1.  Brute force computation.
  
      for (i=0;i<81;i++)
      {
        if (i%9 == 0) q(2,"\n");
        u = 27*(i/27);
        v = 9*((i%9)/3);
        p = (3*(i/9))%9;
        q = i%3;
        fprintf(fout," %3d ",u+v+p+q);
      }

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