Temporal evolution of the H- and He-burning luminosity (upper panels) and the structure of convection region (the shaped region) near the surface (bottom panels) during the flashes. The model has M_i = 0.8 M_⊙ and M_c = 0.448 M_⊙ at the onset of the CE ejection. The plus and the filled dot show the positions where the first He and H flash occur, respectively (see Fig. 3). The dashed line in the bottom panels is the boundary of the H-rich envelope, that is, the H mass abundance of X_H = 0.1. The convection developed during the first He flash penetrates the H-rich envelope, resulting in an additional very strong H flash. The right two panels zoom in on the first He and H flashes.