-er -ol bbb bbe bbi bbk bbl bbo bbr be- beb bee bei bek bel beo ber bev bi- bib bie bii bik bil bio bir biv bkb bke bkk bkl bko bkr bkv blb ble bli blk bll blo blr blv bob boe boi bok bol boo bor bov brb bre bri brk brl bro brr brv bvb bve bvi bvk bvl bvo bvr bvv ebb ebe ebi ebk ebl ebo ebr ebv eeb eee eek eel eeo eer eev eib eie eii eik eil eio eir eiv ekb eke eki ekl eko ekr ekv elb ele eli elk ell elo elr elv eo- eob eoe eoi eok eol eoo eor erb ere eri erk erl ero err erv evb eve evi evl evo evr evv i-v ibb ibe ibi ibk ibl ibo ibr ibv ie- iee iei iek iel ier iev iib iie iii iil iio iir ikb ike iki ikk ikl iko ikr ikv il- ilb ile ili ilk ill ilo ilr ilv io- iob ioe ioi iol ioo ior iov ir- irb ire iri irk irl iro irr irv ivb ive ivi ivl ivo ivr ivv kbb kbe kbi kbk kbl kbo kbr ke- keb kee kei kek kel keo ker kev kib kie kii kik kil kio kir kiv kkb kke kki kkk kkl kkr kkv kl- klb kli klo klr klv kob koe koi kok kol koo kor kri krk krl kro krr krv kvb kvi kvk kvo kvr kvv lbb lbe lbi lbk lbl lbo lbr lbv leb lee lei lek lel leo ler lev lib lie lii lik lil lio lir liv lkb lkl lkr llb lle lli llk lll llo llr llv lob loe loi lok lol loo lor lov lrb lri lrk lro lrr lrv lvb lve lvi lvl lvr lvv o-i ob- obb obe obi obk obl obo obr obv oeb oee oei oel oeo oer oib oie oii oik oil oio oir oiv okb oke oki okk okl oko okr olb ole oli olk oll olo oo- oob ooi ook ool ooo oor oov or- orb ore ori ork orl oro orr orv ov- ovb ove ovi ovl ovo ovv rbb rbe rbi rbk rbl rbo rbr re- reb ree rei rek rel reo rer rev rib rie rii rik ril rio rir riv rkb rke rkk rko rkv rle rli rll rlo rlr rob roe roi rok rol roo ror rov rrb rri rrk rrl rrr rvb rve rvi rvl rvo rvr rvv v-e vbi vbk vbl vbo vbr vbv veb vee vei vek vel veo ver vi- vib vie vii vik vil vio vir viv vkb vl- vlb vle vlk vll vlo vlv vob voe voi vok vol voo vor vov vrb vre vri vrk vrr vvb vvi vvo vvr vvv