| #### D.3.1.5 flatten Procedure from library `matrix.lib` (see matrix_lib). Usage: flatten(A); A matrix/smatrix Return: ideal, generated by all entries from A resp. all columns of A appended Example:
    LIB "matrix.lib";
    ring r = 0,(x,y,z),ds;
    matrix A[2][3] = 1,2,x,y,z,7;
    print(A);
    ==> 1,2,x,
    ==> y,z,7
    flatten(A);
    ==> _[1]=1
    ==> _[2]=2
    ==> _[3]=x
    ==> _[4]=y
    ==> _[5]=z
    ==> _[6]=7
    flatten(smatrix(A));
    ==> 1,
    ==> y,
    ==> 2,
    ==> z,
    ==> x,
    ==> 7

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