a-a a-b a-c a-t aaa aab aac aak aao aas aat aau ab- aba abb abc abk abo abs abt abu ac- aca acb acc ack aco acs act acu aka akb akc akk ako aks aku aoa aob aoc aok aoo aos aot aou as- asa asb asc ask aso ass ast asu at- ata atb atc ato ats att atu au- aua aub auc auk auo aus aut b-u baa bab bac bak bao bas bat bau bba bbb bbc bbk bbo bbs bbt bbu bca bcb bcc bck bco bcs bct bcu bka bkb bkc bkk bko bks bkt boa bob boc bok boo bos bot bou bsa bsb bsc bsk bso bss bst bsu bta btb btc btk bto bts btt btu bua bub buc buk buo bus but buu c-- caa cab cac cak cao cas cat cau cba cbb cbc cbk cbo cbs cbt cbu cca ccb ccc cck cco ccs cct ccu cka ckb ckc cko cks ckt co- coa cob coc cok coo cos cot cou csa csb csc csk cso css cst csu cta ctb ctc ctk cto cts ctt ctu cua cub cuc cuk cuo cus cut cuu k-t ka- kaa kab kac kak kao kas kat kau kba kbb kbc kbk kbo kbs kbu kca kcb kcc kck kcs kct kcu kkb kkc kkk kks kkt kku koa kob koc kok koo kos kot kou ksa ksb ksc ksk kso kss kst ksu kta ktb ktc ktk kto kts ktt ktu kub kuc kuk kus kut kuu oaa oab oac oak oao oas oat oau ob- oba obb obc obk obo obs obt obu oc- oca ocb occ ock oco ocs oct ocu oka okb okc okk oko oks oku oo- ooa oob ooc ook ooo oos oot os- osa osb osc osk oso oss ost osu ot- ota otb otc otk oto ots ott otu ou- oua ouc ouk ouo ous out saa sab sac sak sao sas sat sau sba sbb sbc sbk sbo sbs sbt sbu sca scb scc sck sco scs sct scu sk- ska skb skc skk sko sks skt sku soa sob soc sok soo sos sot sou ss- ssa ssb ssc ssk sso sss sst ssu sta stb stc stk sto sts stt stu sua sub suc suk suo sus sut suu taa tab tac tak tao tas tat tau tba tbb tbc tbk tbo tbs tbt tbu tca tcb tcc tck tco tcs tct tcu tka tkb tkc tkk tko tks tkt to- toa tob toc tok too tos tot tou tsa tsb tsc tsk tso tss tst tsu tta ttb ttc ttk tto tts ttt ttu tua tub tuc tuk tuo tus tut tuu ua- uaa uab uac uak uao uas uat uau uba ubb ubc ubk ubo ubs ubt ubu uca ucb ucc uck uco ucs uct ucu uka ukb ukc ukk uku uoa uob uoc uok uoo uos uot usa usb usc usk uso uss ust usu uta utb utc utk uto uts utt utu uua uuc uus uut uuu