The Su-Schrieffer-Heeger . (SSH) chain is a one-dimensional lattice that comprises two dimerized sublattices. Recently, Zhu, Prodan, and Ahn (ZPA) [Phys. Rev. B 99, 041117(R) (2019)] proposed flat bands can occur at the topological domain walls of two-dimensional array SSH chains. Here, we suggest insulator protected by inversion time-reversal symmetries without spin-orbit coupling. It shown ch...