er to this question is irrelevant.
    If pmut_opt = 1 but the answer to the previous question is YES, then the
    answer to this question is irrelevant. Otherwise, this question is answered
    by specifying a bit permutation . The first line of the answer is the number
    of bits N<SUB>B </SUB>of U<SUB>initial</SUB>. The next line should be a
    permutation of the set {0, 1, 2, ..., N<SUB>B</SUB>-1}. For example, for
    2 bits, there are 2 permutations "0 &nbsp; 1" and "1 &nbsp; 0", where "0
    &nbsp