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Through the asymptotic analysis, the solitonic excitations are shown to be influenced by the thermal and structural inhomogeneities, which can convert the rectilinear propagations into the curvilinear propagations and make the energy fluctuate. In particular, the shape changing collision and periodic interference of the solitonic excitations are analyzed. Energy exchange among the three hydrogen bonding spines is demonstrated, revealing the potential connection among three spines that used to be ignored in the one-spine model. The solitonic interference period is found to be determined by the thermal and structural inhomogeneities. 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