-ol b-u bbb bbc bbk bbl bbn bbo bbu bcb bcc bck bcl bcn bco bcu bkb bkc bkk bkl bkn bko blb blc blk bll bln blo blu bnb bnc bnk bnl bnn bno bnu bob boc bok bol bon boo bou bub buc buk bul bun buo buu c-- cbb cbc cbk cbl cbn cbo cbu ccb ccc cck ccl ccn cco ccu ckb ckc cko cl- clb clc clk cll cln clo clu cn- cnb cnc cnl cnn cno cnu co- cob coc cok col con coo cou cub cuc cuk cul cun cuo cuu kbb kbc kbk kbl kbn kbo kbu kcb kcc kck kcl kcn kcu kkb kkc kkk kkl kkn kku kl- klb klc klo klu kn- knc knk knl knn kno knu kob koc kok kol kon koo kou kub kuc kuk kul kun kuu lbb lbc lbk lbl lbo lbu lcb lcc lck lcl lcn lco lcu lkb lkl llb llc llk lll lln llo llu lnb lnc lnk lnl lnn lno lnu lob loc lok lol lon loo lou lub luc luk lul lun luo luu nbb nbc nbk nbl nbn nbo nbu ncb ncc nck ncl ncn nco ncu nkc nkk nkn nko nku nlb nlc nlk nll nln nlo nlu nnb nnc nnk nnl nnn nno nnu no- nob noc nok nol non noo nou nub nuc nuk nul nun nuo nuu ob- obb obc obk obl obn obo obu oc- ocb occ ock ocl ocn oco ocu okb okc okk okl oko oku olb olc olk oll oln olo olu on- onb onc onk onl onn ono onu oo- oob ooc ook ool oon ooo ou- ouc ouk oul oun ouo ubb ubc ubk ubl ubn ubo ubu ucb ucc uck ucl ucn uco ucu ukb ukc ukk ukl ukn uku ulb ulc ulk ull uln ulo ulu un- unb unc unk unl unn uno unu uob uoc uok uol uon uoo uuc uun uuu