  Based on a few basic assumptions, a predictive supersymmetric grand
unification $G_{U}=SO(10)\times \Delta_{48}(SU(3))\times U(1)$ model is
proposed. Thus, all the observed 45 chiral fermions with additional 3
right-handed neutrinos are unified into an irreducible triplet 16-dimensional
spinor representation of $G_{U}$. Electroweak symmetry breaking naturally
requires two Higgs doublets which belong to a single 10 representation of
$SO(10)$. The model provides an unified description for all the Yukawa and
gauge couplings. With a given structure of the physical vacuum, the fermion
masses and mixings are predicted in terms of two basic parameters.
