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Recent studies show that a dimer, consisting of two identical spheres rigidly connected by a rod, can exhibit periodic motions over a sinusoidally vibrating plate.It is clear that impacts, friction and the plate vibration are the physical mechanisms responsible for the excitation of the specific motions.Our recent simulations revealed that only two parameters, the coefficient of restitution e in impacts and the intensity F in the plate vibration, play a crucial role of activating the periodic motion.