  We show that graph map with zero topological entropy is Li-Yorke chaotic if
and only if it has an NS-pair (a pair of non-separable points containing in a
same solenoidal $\omega$-limit set), and a non-diagonal pair is an NS-pair if
and only if it is an IN-pair if and only if it is an IT-pair. This completes
characterization of zero topological sequence entropy for graph maps.
