-ol b-u bbb bbc bbk bbl bbo bbt bbu bcb bcc bck bcl bco bct bcu bkb bkc bkk bkl bko bkt blb blc blk bll blo blt blu bob boc bok bol boo bot bou btb btc btk btl bto btt btu bub buc buk bul buo but buu c-- cbb cbc cbk cbl cbo cbt cbu ccb ccc cck ccl cco cct ccu ckb ckc cko ckt cl- clb clc clk cll clo clt clu co- cob coc cok col coo cot cou ctb ctc ctk ctl cto ctt ctu cub cuc cuk cul cuo cut cuu k-t kbb kbc kbk kbl kbo kbu kcb kcc kck kcl kct kcu kkb kkc kkk kkl kkt kku kl- klb klc klo klt klu kob koc kok kol koo kot kou ktb ktc ktk ktl kto ktt ktu kub kuc kuk kul kut kuu lbb lbc lbk lbl lbo lbt lbu lcb lcc lck lcl lco lct lcu lkb lkl lkt llb llc llk lll llo llt llu lob loc lok lol loo lot lou ltb ltc ltk ltl lto ltt ltu lub luc luk lul luo lut luu ob- obb obc obk obl obo obt obu oc- ocb occ ock ocl oco oct ocu okb okc okk okl oko oku olb olc olk oll olo olt olu oo- oob ooc ook ool ooo oot ot- otb otc otk otl oto ott otu ou- ouc ouk oul ouo out tbb tbc tbk tbl tbo tbt tbu tcb tcc tck tcl tco tct tcu tkb tkc tkk tkl tko tkt tlc tlk tll tlo tlt tlu to- tob toc tok tol too tot tou ttb ttc ttk ttl tto ttt ttu tub tuc tuk tul tuo tut tuu ubb ubc ubk ubl ubo ubt ubu ucb ucc uck ucl uco uct ucu ukb ukc ukk ukl uku ulb ulc ulk ull ulo ult ulu uob uoc uok uol uoo uot utb utc utk utl uto utt utu uuc uut uuu