-ol b-u bbb bbc bbl bbo bbu bcb bcc bcl bco bcu blb blc bll blo blu bob boc bol boo bou bub buc bul buo buu c-- cbb cbc cbl cbo cbu ccb ccc ccl cco ccu cl- clb clc cll clo clu co- cob coc col coo cou cub cuc cul cuo cuu lbb lbc lbl lbo lbu lcb lcc lcl lco lcu llb llc lll llo llu lob loc lol loo lou lub luc lul luo luu ob- obb obc obl obo obu oc- ocb occ ocl oco ocu olb olc oll olo olu oo- oob ooc ool ooo ou- ouc oul ouo ubb ubc ubl ubo ubu ucb ucc ucl uco ucu ulb ulc ull ulo ulu uob uoc uol uoo uuc uuu