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Anisotropic flow,one of the most important observables in relativistic heavy-ion collisions,describes final particle distributions in transverse momentum space.It is the hydrodynamic response to the anisotropic initial density profile.Therefore,the EbE fluctuations and correlations among flows are useful in understanding the initial condition and transport properties of relativistic heavy-ion collisions.While elliptic and triangle flows response almost linearly to the eccentricities of the same order,higher flows are affected by nonlinear mode coupling effects.