def array_form(self):
        """
        Return a copy of the attribute _array_form
        Examples
        ========

        >>> Permutation.print_cyclic = False
        >>> p = Permutation([[2, 0], [3, 1]])
        >>> p.array_form
        [2, 3, 0, 1]
        >>> Permutation([[2, 0, 3, 1]]).array_form
        [3, 2, 0, 1]
        >>> Permutation([2, 0, 3, 1]).array_form
        [2, 0, 3, 1]
        >>> Permutation([[1, 2], [4, 5]]).array_form
        [0, 2, 1, 3, 5, 4]

        """
        return self._array_form[:]