PROGRAM d8r10(input,output);
(* driver for routine ECLASS *)
CONST
   m=11;
   n=15;
TYPE
   glnarray = ARRAY [1..n] OF integer;
   glmarray = ARRAY [1..m] OF integer;
VAR
   i,j,k,lclas,nclass : integer;
   lista,listb : glmarray;
   nf,nflag,nsav : glnarray;

(*$I MODFILE.PAS *)
(*$I ECLASS.PAS *)

BEGIN
   lista[1] := 1; lista[2] := 1; lista[3] := 5; lista[4] := 2;
   lista[5] := 6; lista[6] := 2; lista[7] := 7; lista[8] := 11;
   lista[9] := 3; lista[10] := 4; lista[11] := 12;
   listb[1] := 5; listb[2] := 9; listb[3] := 13; listb[4] := 6;
   listb[5] := 10; listb[6] := 14; listb[7] := 3; listb[8] := 7;
   listb[9] := 15; listb[10] := 8; listb[11] := 4;
   eclass(nf,n,lista,listb,m);
   FOR i := 1 to n DO BEGIN
      nflag[i] := 1
   END;
   writeln;
   writeln('Numbers from 1-15 divided according to');
   writeln('their value modulo 4:');
   writeln;
   lclas := 0;
   FOR i := 1 to n DO BEGIN
      nclass := nf[i];
      IF (nflag[nclass] <> 0)  THEN BEGIN
         nflag[nclass] := 0;
         lclas := lclas+1;
         k := 0;
         FOR j := i to n DO BEGIN
            IF  (nf[j] = nf[i])  THEN BEGIN
               k := k+1;
               nsav[k] := j
            END
         END;
         write('Class',lclas:2,':   ');
         FOR j := 1 to k DO write(nsav[j]:3);
         writeln
      END
   END
END.