  We present an overall empirical formula that, after specification of its free
parameters, describes precisely the mass spectrum of charged leptons and is
suggested to reproduce correctly also the mass spectra of neutrinos and up and
down quarks (together, twelve masses with eight free parameters are presented).
Then, it predicts m_tau = 1776.80 MeV, m_{nu_1} -> 0 eV and m_d = 5.0 MeV, $m_s
= 102 MeV, respectively, when the remaining lepton and quark masses, m_e, m_mu,
Delta m^2_{21} = m^2_{nu_2}-m^2_{nu_1}, Delta m^2_{32} = m^2_{nu_3}-m^2_{nu_2}
and m_u, m_c, m_t, m_b, are taken as an input.
