-ol b-u bbb bbc bbe bbk bbl bbo bbu bcb bcc bce bck bcl bco bcu be- beb bec bee bek bel beo beu bkb bkc bke bkk bkl bko blb blc ble blk bll blo blu bob boc boe bok bol boo bou bub buc bue buk bul buo buu c-- cbb cbc cbe cbk cbl cbo cbu ccb ccc cce cck ccl cco ccu ce- ceb cec cee cek cel ceo ceu ckb ckc cko cl- clb clc cle clk cll clo clu co- cob coc coe cok col coo cou cub cuc cue cuk cul cuo cuu ebb ebc ebe ebk ebl ebo ebu ec- ecb ecc ece eck ecl eco ecu eeb eec eee eek eel eeo ekb ekc eke ekl eko eku elb elc ele elk ell elo elu eo- eob eoc eoe eok eol eoo eou eu- eub euc eue eul kbb kbc kbe kbk kbl kbo kbu kcb kcc kce kck kcl kcu ke- keb kec kee kek kel keo kkb kkc kke kkk kkl kku kl- klb klc klo klu kob koc koe kok kol koo kou kub kuc kue kuk kul kuu lbb lbc lbe lbk lbl lbo lbu lcb lcc lce lck lcl lco lcu leb lec lee lek lel leo leu lkb lkl llb llc lle llk lll llo llu lob loc loe lok lol loo lou lub luc lue luk lul luo luu ob- obb obc obe obk obl obo obu oc- ocb occ ock ocl oco ocu oeb oec oee oel oeo okb okc oke okk okl oko oku olb olc ole olk oll olo olu oo- oob ooc ook ool ooo ou- ouc oue ouk oul ouo ubb ubc ube ubk ubl ubo ubu ucb ucc uce uck ucl uco ucu ueb uec uee uel ukb ukc uke ukk ukl uku ulb ulc ule ulk ull ulo ulu uob uoc uoe uok uol uoo uuc uue uuu