The time evolution of |c_n(t)|² for N = 4 with the initial configuration (00100), i.e., bosons are divided equally and there are two bosons in each well, which correspond to the red lines of the second panel in Fig. 8. The first panel is for U₃/U₂ = −1 (the condition of Eq. (5) is satisfied) with both U₂ = 6 and U₂ = 0.05, which correspond to the red lines in Figs.8(e) and 8(g); the second and the third panels are with respect to U₃/U₂ = 2 (the condition of Eq. (5) is not satisfied) with U₂ = 0.05 and U₂ = 6, respectively, which correspond to the red lines in Figs. 8(f) and 8(h).