[en] A composite scheme with chiral doublet of charges Q=(2/3, -1/3) is considered. The scheme is self-consistent in the sense that the constituent spectator chiral symmetry SU(2)xU(1) coincides with the chiral electro-weak symmetry. Due to the mirror fermions they both are anomaly free. The chiral colour symmetry arises as an effective symmetry of composite quarks. The scheme contains exotic composite fermions with isospin I=3/2. The common maximal effective symmetry of both ordinary and exotic composite fermions is the chiral SU(2)xSU(4) one, the latter being possible partial unified symmetry