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We discuss the aspects of the little Higgs model with the $SU(4)_L \timesU(1)_X$ electroweak gauge group as an alternative solution to the naturalnessand fine-tuning issues. We introduce anomaly-free fermion spectra, and presenttheir interactions with the physical gauge bosons. We also discuss somephenomenological implications of these fermions and the extra gauge bosonsbased on recent experimental results.

Fermions and gauge bosons in $SU(4)_L \times U(1)_X$ models with little Higgs