| #### D.8.7.6 gaussColWithoutPerm Procedure from library `recover.lib` (see recover_lib). Usage: gaussColWithoutPerm(M); M a matrix of constant polynomials Return: matrix: basic Gaussian column reduction of M, just without permuting the columns Example:
    LIB "recover.lib";
    ring r=0,x,dp;
    matrix M[3][4]=0,1,0,2,1,2,3,4,1,0,5,0;
    print(M);
    ==> 0,1,0,2,
    ==> 1,2,3,4,
    ==> 1,0,5,0
    print(gaussColWithoutPerm(M));
    ==> 0,1,0,0,
    ==> 1,2,0,0,
    ==> 1,0,2,0

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