-ol bbb bbe bbk bbl bbo be- beb bee bek bel beo bev bkb bke bkk bkl bko bkv blb ble blk bll blo blv bob boe bok bol boo bov bvb bve bvk bvl bvo bvv ebb ebe ebk ebl ebo ebv eeb eee eek eel eeo eev ekb eke ekl eko ekv elb ele elk ell elo elv eo- eob eoe eok eol eoo evb eve evl evo evv kbb kbe kbk kbl kbo ke- keb kee kek kel keo kev kkb kke kkk kkl kkv kl- klb klo klv kob koe kok kol koo kvb kvk kvo kvv lbb lbe lbk lbl lbo lbv leb lee lek lel leo lev lkb lkl llb lle llk lll llo llv lob loe lok lol loo lov lvb lve lvl lvv ob- obb obe obk obl obo obv oeb oee oel oeo okb oke okk okl oko olb ole olk oll olo oo- oob ook ool ooo oov ov- ovb ove ovl ovo ovv v-e vbk vbl vbo vbv veb vee vek vel veo vkb vl- vlb vle vlk vll vlo vlv vob voe vok vol voo vov vvb vvo vvv