-ol b-u bbb bbc bbe bbl bbo bbt bbu bcb bcc bce bcl bco bct bcu be- beb bec bee bel beo bet beu blb blc ble bll blo blt blu bob boc boe bol boo bot bou btb btc bte btl bto btt btu bub buc bue bul buo but buu c-- cbb cbc cbe cbl cbo cbt cbu ccb ccc cce ccl cco cct ccu ce- ceb cec cee cel ceo cet ceu cl- clb clc cle cll clo clt clu co- cob coc coe col coo cot cou ctb ctc cte ctl cto ctt ctu cub cuc cue cul cuo cut cuu ebb ebc ebe ebl ebo ebt ebu ec- ecb ecc ece ecl eco ect ecu eeb eec eee eel eeo eet elb elc ele ell elo elt elu eo- eob eoc eoe eol eoo eot eou etb etc ete etl eto ett etu eu- eub euc eue eul eut lbb lbc lbe lbl lbo lbt lbu lcb lcc lce lcl lco lct lcu leb lec lee lel leo let leu llb llc lle lll llo llt llu lob loc loe lol loo lot lou ltb ltc lte ltl lto ltt ltu lub luc lue lul luo lut luu ob- obb obc obe obl obo obt obu oc- ocb occ ocl oco oct ocu oeb oec oee oel oeo oet olb olc ole oll olo olt olu oo- oob ooc ool ooo oot ot- otb otc ote otl oto ott otu ou- ouc oue oul ouo out tbb tbc tbe tbl tbo tbt tbu tcb tcc tce tcl tco tct tcu te- teb tec tee tel teo tet teu tlc tle tll tlo tlt tlu to- tob toc toe tol too tot tou ttb ttc tte ttl tto ttt ttu tub tuc tue tul tuo tut tuu ubb ubc ube ubl ubo ubt ubu ucb ucc uce ucl uco uct ucu ueb uec uee uel uet ulb ulc ule ull ulo ult ulu uob uoc uoe uol uoo uot utb utc ute utl uto utt utu uuc uue uut uuu