-ol b-u bbb bbc bbl bbn bbo bbu bcb bcc bcl bcn bco bcu blb blc bll bln blo blu bnb bnc bnl bnn bno bnu bob boc bol bon boo bou bub buc bul bun buo buu c-- cbb cbc cbl cbn cbo cbu ccb ccc ccl ccn cco ccu cl- clb clc cll cln clo clu cn- cnb cnc cnl cnn cno cnu co- cob coc col con coo cou cub cuc cul cun cuo cuu lbb lbc lbl lbo lbu lcb lcc lcl lcn lco lcu llb llc lll lln llo llu lnb lnc lnl lnn lno lnu lob loc lol lon loo lou lub luc lul lun luo luu nbb nbc nbl nbn nbo nbu ncb ncc ncl ncn nco ncu nlb nlc nll nln nlo nlu nnb nnc nnl nnn nno nnu no- nob noc nol non noo nou nub nuc nul nun nuo nuu ob- obb obc obl obn obo obu oc- ocb occ ocl ocn oco ocu olb olc oll oln olo olu on- onb onc onl onn ono onu oo- oob ooc ool oon ooo ou- ouc oul oun ouo ubb ubc ubl ubn ubo ubu ucb ucc ucl ucn uco ucu ulb ulc ull uln ulo ulu un- unb unc unl unn uno unu uob uoc uol uon uoo uuc uun uuu