The time evolution of |c_n(t)|² for N = 4 with the initial configuration (01000), i.e., there is only one boson in the left well while three bosons are in the right well. 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 blue lines in Figs. 8(e) and 8(g); the second and the third panels are with respect to U₃/U₂ = 1/6 (the condition of Eq. (5) is not satisfied) with U₂ = 0.05 and U₂ = 6, respectively, which correspond to the blue lines in Figs. 8(f) and 8(h).