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If left-right gauge theory occurs as an intermediate symmetry in a GUT then,apart from other advantages, it is possible to obtain the see-saw scalenecessary to understand small neutrino masses with Majorana coupling of orderunity. Barring threshold or non-renormalizable gravitational effects, orassumed presence of additional light scalar particles of unprescribed origin,all other attempts to achieve manifest one-loop gauge coupling unification inSUSY SO(10) with left-right intermediate symmetry have not been successful sofar. Attributing this failure to lack of flavor symmetry in the GUT, we showhow the spontaneous symmetry breaking of $SO(10)\times S_4$ leads to suchintermediate scale extending over a wide range, $M_R \simeq 5\times 10^{9}$ GeVto $10^{15}$ GeV. All the charged fermion masses are fitted at the see-sawscale, $M_N\simeq M_R \simeq 4 \times 10^{13}$ GeV which is obtained withMajorana coupling $f_0 \simeq 1$. Using a constrained parametrization in whichCP-violation originates only from quark sector, besides other predictions madein the neutrino sector, the reactor mixing angle is found to be $\theta_{13}\simeq 3^{\circ} - 5^{\circ}$ which is in the range accessible to ongoing andplanned experiments. The leptonic Dirac phase turns out to be $\delta \sim 2.9-3.1$ radians with Jarlskog invariant $J \sim 2.95 \times 10^{-5} - 10^{-3}$.

Intermediate left-right gauge symmetry, unification of couplings and fermion masses in SUSY $SO(10)\times S_4$