s2dr r2dr2t q2dr2 p2dr o2dr2t

3bdr2t 2bdr2 1bdr 0bdr2t zbdr2

elcr2 dlcr clcr2t blcr2 alcr

pubr oubr2t nubr2 mubr lubr2t

03ar2t z3ar2 y3ar x3ar2t w3ar2