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There are different models based on the gauge symmetry $SU(3)_C \otimesSU(3)_L \otimes U(1)_X$ (331) some of them includes exotic particles and othersare constructed without any exotic charges assigned to the fermionic spectrum.Each model build up on 331 symmetry has its own interesting propertiesaccording to the representations of the gauge group used for the fermionicspectrum; that is the main reason to explore and identify the possible sourcesof flavor changing neutral currents and lepton flavor violation at tree level.

Sources of FCNC in $SU(3)_C \otimes SU(3)_L \otimes U(1)_X$ models