code 34236;
    procedure GSSINV(A, N, AUX); value N; integer N;
    array A, AUX;
    begin integer array RI, CI[1:N];
        GSSELM(A, N, AUX, RI, CI);
        if AUX[3] = N then AUX[9]:= INV1(A, N, RI, CI, true )
    end GSSINV;
        eop