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We determined the quark mass matrix in terms of a small expansion parameter$\sqrt{\varepsilon}$, which gives correctly all the quark masses and the CKMmatrix elements at the electroweak (EW) scale, and obtain a progenitor form atthe GUT scale by running the EW scale mass matrix. Finally, a possible textureform for the progenitor quark mass matrix is suggested.

On the progenitor quark mass matrix