among the corresponding oscillators, whereas the other oscillators away from it still evolve independently as indicated by the spread of the sets over their attractors (see Figs. \[fig13\](g-h)). The more localized sets in Figs. \[fig13\](i-j) for $\varepsilon = 0.52$ indicate that the respective oscillators are in complete phase synchrony while the other systems away from it are in asynchronization with it as confirmed by the spread of the sets in Figs. \[fig13\](k-l). For $\varepsilon = 0.65$, the sets are bounded to smaller regions of the attractors in Figs. \[fig13\](m-o) attributing to the existence of CPS between the drive and subsystems $10$ and $30$. The other subsystem with index $i=50$ is in its transition state as indicated by the localized set but in a large region of the attractor as seen in Fig. \[fig13\](p). Thus it is clear from these figures that the oscillators away from the drive system are synchronized sequentially as the coupling strength is increased gradually. Finally, for $\varepsilon = 0.8$, the sets are localized to a narrow region on the attractors (Figs. \[fig13\](q-t)) of all the subsystems thereby confirming the existence of GPS.

![\[fig13a\] The first six maximal Lyapunov exponents $\lambda_{max}$ of the threshold piecewise linear time-delay 