-er bbb bbe bbg bbn bbr be- beb bee beg ben ber bev bez bgb bge bgg bgn bgr bgv bgz bnb bne bng bnn bnr bnv bnz brb bre brg brn brr brv brz bvb bve bvg bvn bvr bvv bze bzn bzr bzz ebb ebe ebg ebn ebr ebv eeb eee eeg een eer eev egb ege egg egn egr en- enb ene eng enn enr env enz erb ere erg ern err erv erz evb eve evg evn evr evv eze ezr ezz gbe gbg gbn gbr gbv gbz ge- geb gee geg gen ger gev gez ggb ggg ggn ggr ggv ggz gnb gne gnn gnr gnv grb gre grg grn grr grv gvb gve gvg gvn gvr gzr nbb nbe nbg nbn nbr nbv ne- neb nee neg nen ner nev nez ngb nge ngg ngn nnb nne nng nnn nnv nnz nrb nre nrg nrn nrr nrv nrz nvb nve nvg nvn nvv nzb nze nzg nzz rbb rbe rbg rbn rbr re- reb ree reg ren rer rev rez rgb rge rgg rgn rgr rgv rnb rng rnn rnr rnv rnz rrb rrg rrn rrr rvb rve rvg rvn rvr rvv rzb rze v-e vbg vbr vbv vbz veb vee veg ven ver vez vgg vgn vgr vgz vn- vng vnr vnv vrb vre vrg vrn vrr vvb vvg vvr vvv vvz vzn z-g zbb zbr zbv zeb zee zen zer zev zez zgb zgg zgv zne znn zzr zzz