-er bbb bbe bbg bbn bbr be- beb bee beg ben ber bev bgb bge bgg bgn bgr bgv bnb bne bng bnn bnr bnv brb bre brg brn brr brv bvb bve bvg bvn bvr bvv ebb ebe ebg ebn ebr ebv eeb eee eeg een eer eev egb ege egg egn egr en- enb ene eng enn enr env erb ere erg ern err erv evb eve evg evn evr evv gbe gbg gbn gbr gbv ge- geb gee geg gen ger gev ggb ggg ggn ggr ggv gnb gne gnn gnr gnv grb gre grg grn grr grv gvb gve gvg gvn gvr nbb nbe nbg nbn nbr nbv ne- neb nee neg nen ner nev ngb nge ngg ngn nnb nne nng nnn nnv nrb nre nrg nrn nrr nrv nvb nve nvg nvn nvv rbb rbe rbg rbn rbr re- reb ree reg ren rer rev rgb rge rgg rgn rgr rgv rnb rng rnn rnr rnv rrb rrg rrn rrr rvb rve rvg rvn rvr rvv v-e vbg vbr vbv veb vee veg ven ver vgg vgn vgr vn- vng vnr vnv vrb vre vrg vrn vrr vvb vvg vvr vvv