-ol b-u bbb bbc bbk bbl bbo bbs bbu bcb bcc bck bcl bco bcs bcu bkb bkc bkk bkl bko bks blb blc blk bll blo bls blu bob boc bok bol boo bos bou bsb bsc bsk bsl bso bss bsu bub buc buk bul buo bus buu c-- cbb cbc cbk cbl cbo cbs cbu ccb ccc cck ccl cco ccs ccu ckb ckc cko cks cl- clb clc clk cll clo cls clu co- cob coc cok col coo cos cou csb csc csk csl cso css csu cub cuc cuk cul cuo cus cuu kbb kbc kbk kbl kbo kbs kbu kcb kcc kck kcl kcs kcu kkb kkc kkk kkl kks kku kl- klb klc klo kls klu kob koc kok kol koo kos kou ksb ksc ksk ksl kso kss ksu kub kuc kuk kul kus kuu lbb lbc lbk lbl lbo lbs lbu lcb lcc lck lcl lco lcs lcu lkb lkl lks llb llc llk lll llo lls llu lob loc lok lol loo los lou lsb lsc lsk lsl lso lss lsu lub luc luk lul luo lus luu ob- obb obc obk obl obo obs obu oc- ocb occ ock ocl oco ocs ocu okb okc okk okl oko oks oku olb olc olk oll olo ols olu oo- oob ooc ook ool ooo oos os- osb osc osk osl oso oss osu ou- ouc ouk oul ouo ous sbb sbc sbk sbl sbo sbs sbu scb scc sck scl sco scs scu sk- skb skc skk skl sko sks sku slb slc slk sll slo sls slu sob soc sok sol soo sos sou ss- ssb ssc ssk ssl sso sss ssu sub suc suk sul suo sus suu ubb ubc ubk ubl ubo ubs ubu ucb ucc uck ucl uco ucs ucu ukb ukc ukk ukl uku ulb ulc ulk ull ulo uls ulu uob uoc uok uol uoo uos usb usc usk usl uso uss usu uuc uus uuu