  We describe a solution to a long standing puzzle about the difference in
textures of quark CKM and lepton PMNS mixing matrices by deriving their common
representation. We show how the difference in texture of the two matrices
arises from assignment of lepton and quark pairs to different representation of
a discrete two element symmetry group. The symmetry is absent in the Standard
Model. It appears if, instead of Dirac spinors, one describes fermions in terms
of bi-spinors and induces essentially unique textures: tri-bimaximal for lepton
and O({\lambda}) of Wolfenstein parameterization for quark mixing.
