-ol b-u bbb bbc bbl bbo bbt bbu bcb bcc bcl bco bct bcu blb blc bll blo blt blu bob boc bol boo bot bou btb btc btl bto btt btu bub buc bul buo but buu c-- cbb cbc cbl cbo cbt cbu ccb ccc ccl cco cct ccu cl- clb clc cll clo clt clu co- cob coc col coo cot cou ctb ctc ctl cto ctt ctu cub cuc cul cuo cut cuu lbb lbc lbl lbo lbt lbu lcb lcc lcl lco lct lcu llb llc lll llo llt llu lob loc lol loo lot lou ltb ltc ltl lto ltt ltu lub luc lul luo lut luu ob- obb obc obl obo obt obu oc- ocb occ ocl oco oct ocu olb olc oll olo olt olu oo- oob ooc ool ooo oot ot- otb otc otl oto ott otu ou- ouc oul ouo out tbb tbc tbl tbo tbt tbu tcb tcc tcl tco tct tcu tlc tll tlo tlt tlu to- tob toc tol too tot tou ttb ttc ttl tto ttt ttu tub tuc tul tuo tut tuu ubb ubc ubl ubo ubt ubu ucb ucc ucl uco uct ucu ulb ulc ull ulo ult ulu uob uoc uol uoo uot utb utc utl uto utt utu uuc uut uuu