}\cdot t : t\geq0$ is an odd number, $t\not\equiv 0(mod\,0)\}$\ are isolated about $gcd$, i.e. $$\textcolor[rgb]{0.00,0.00,0.00}{gcd(L_{0}(n),L_{0}(m))=L_{0}(gcd(n,m))}\notag$$ for $\forall n,m \in M_{k