  The recent accurate determination of the CKM parameters including the maximal
CP phase 90 degrees enables us to write down the up-type and down-type quark
mass matrices to a high degree of accuracy. The lightest element(the uu
element) of the quark mass texture (not the mass eigenvalue) has a power
lambda**6 where lambda=sin(Cabibbo angle). The CP phase of 360 degrees divided
by an integer hints a discrete symmetry. Since lambda**6 is the highest power
among the quark mass matrix elements, we present as an example a possibility
that the maximal CP phase 90 degrees is obtainable from a supersymmetric Z(12)
discrete symmetry model.
