  If three right-handed neutrinos are added to the Standard Model, then, for
the three known generations, there are six quarks and six leptons. It is then
natural to assume that the symmetry considerations that have been applied to
the quark matrices are also valid for the lepton mass matrices. Under this
assumption, the solar and atmospheric neutrino data can be used to determine
the individual neutrino masses. Using the \chi^2 fit, it is found that the mass
of the lightest neutrino is (2-5)\times10^{-3} eV, that of the next heavier
neutrino is (10-13)\times10^{-3} eV, while the mass of the heaviest neutrino is
(52-54)\times10^{-3} eV.
