-ol bbb bbe bbl bbo bbt be- beb bee bel beo bet bev blb ble bll blo blt blv bob boe bol boo bot bov btb bte btl bto btt btv bvb bve bvl bvo bvt bvv ebb ebe ebl ebo ebt ebv eeb eee eel eeo eet eev elb ele ell elo elt elv eo- eob eoe eol eoo eot etb ete etl eto ett etv evb eve evl evo evt evv lbb lbe lbl lbo lbt lbv leb lee lel leo let lev llb lle lll llo llt llv lob loe lol loo lot lov ltb lte ltl lto ltt ltv lvb lve lvl lvt lvv ob- obb obe obl obo obt obv oeb oee oel oeo oet olb ole oll olo olt oo- oob ool ooo oot oov ot- otb ote otl oto ott otv ov- ovb ove ovl ovo ovv tbb tbe tbl tbo tbt tbv te- teb tee tel teo tet tev tle tll tlo tlt tlv to- tob toe tol too tot tov ttb tte ttl tto ttt ttv tvb tve tvl tvo tvt v-e vbl vbo vbv veb vee vel veo vet vl- vlb vle vll vlo vlt vlv vob voe vol voo vot vov vtb vte vtl vto vtt vtv vvb vvo vvt vvv