  We give an explicit formula of the Alexander polynomial of the link obtained
by adding an arbitrary number of full twists to positively oriented parallel
n-strands in terms of the Alexander polynomials of the links obtained by adding
0,1,...,n-1 full twists. From this, we see that the Alexander polynomials
stabilize after adding sufficiently many full twists. The main tool used in the
computation is expressing the Alexander polynomial using the vector space
representation of $U_{q}(gl(1|1))$.
