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We calculate the dynamics of fast neutrino flavor conversions with Boltzmann collisions of neutrino scatterings in the homogeneous system. We find the enhancement or suppression of the flavor conversions in various setups of the collision terms. We analyze the mechanism of fast flavor conversions based on the motion of polarization vectors in the cylindrical coordinate analogous to a pendulum motion. The phase of the all polarization vector synchronizes in the linear evolution phase, and thedoi:10.1093/ptep/ptac082 fatcat:asu4xm57jvakdmenbd6wvuzz6q