Representative SIMPL integration for (k_2,M, k_2,A) = (1.0, 0.1) with Q_U = 600. The coupled dynamical evolution again avoids a Miranda–Ariel 5:3 resonance encounter. Instead, Umbriel becomes involved in both the Miranda–Umbriel 3:1 and Ariel–Umbriel 5:3 resonances, with the latter interaction governing the long-term evolution of the system.