To close this section we would like to highlight the following. Inspired by the above results other questions naturally arise: What happens to the behavior of the indices when the number of links of type 2 is not only 1 and n -1 (similarly for the number of links of type 1), and Can we identify any patterns? Given n and X 2 fixed or equivalently given n and m fixed, it can be shown by focusing on the non-fixed summands of the expressions obtained in Theorem 1 and Theorem 2 the following: The minimum value of ZCi with i = 1, 2 is )).