  The specific violated mirror symmetry model is capable of generating the
observed lepton weak mixing matrix with a structure similar to the observed one
that almost lacks any visible regularities (the "flavor riddle"). The
peculiarities of the Standard Model (SM): quark and lepton mass hierarchy and
the neutrino spectrum different from this hierarchy appear to be necessary
conditions for reproduction of such a structure. The inverse order of the
neutrino spectrum and a small value of the mass $m_{3}$ are here two other
necessary conditions. The smallness of the angle $\Theta_{1,3}$ is determined
then just by small mass ratios in the hierarchical lepton spectrum. The
explanation is proposed for differences between the neutrino spectrum and other
fermion spectra of SM. The inverse order of the neutrino spectrum and the
observed $\Theta_{1,3}$ angle permit evaluation of the absolute values of
neutrino masses: $m_{1}\sim m_{2}\sim 0.05$eV, $m_{3}\leq 0.01$eV.
