REM dynamical map for the found solution in the (P_c, e_c)- plane of the planet c, the system is coplanar. Small log $\widehat{\text{REM}}$ characterize regular (long-term stable) solutions, marked with black/dark blue color. Dynamically chaotic solutions are marked with lighter colors up to yellow. The black curve is for the geometric collision of the orbits, defined by the condition: a_b(1 + e_b) = a_c(1 − e_c). The resolution of the map is 401 × 201 points.