that naturally predict right-handed neutrinos. However within the framework of $SO(10)$ the quark masses and mixing angles are related to the lepton masses and mixing angles, and the existence of large neutrino mixing angles is not expected in the minimal versions of the theory in which the Higgs doublets are in one (or two) ${\bf 10}'s$ (ten dimensional representations of $SO(10)$) and each matter family is in a ${\bf 16}$. Nevertheless various possibilities have been proposed in $SO(10)$ in order to account for the large neutrino mixing angles. Within the framework of minimal $SO(10)$ with third family Yukawa unification, it has been suggested that if two operators with different Clebsch coefficients contribute with similar strength then, with suitable choice of phases, in the case of the lepton Yukawa matrices one may have large numerical 23 elements, which add up to give a large lepton mixing angle, while for the quarks the 23 elements can be small due to approximate cancellation of the two contributing operators [@BaPaWi]. This is an example of the accidental mechanism mentioned above, where in addition one requires the quark mixing angles to be small by accident, although it remains to be seen if the LMA MSW 