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Consider the general competitive system \dot{u}=uM_1(t;u,v), \dot{v}=vM_2(t;u,v), where \partial M_1/\partial v <0, \partial M_2/\partial u <0, M_i(t+T; u,v) = M_i(t; u, v), i =1, 2. under soniccondit...