a-a a-b a-c a-t aaa aab aac aae aak aas aat aau ab- aba abb abc abe abk abs abt abu ac- aca acb acc ace ack acs act acu aea aeb aec aee aek aes aet aeu aka akb akc ake akk aks aku as- asa asb asc ase ask ass ast asu at- ata atb atc ate ats att atu au- aua aub auc aue auk aus aut b-u baa bab bac bae bak bas bat bau bba bbb bbc bbe bbk bbs bbt bbu bca bcb bcc bce bck bcs bct bcu be- bea beb bec bee bek bes bet beu bka bkb bkc bke bkk bks bkt bsa bsb bsc bse bsk bss bst bsu bta btb btc bte btk bts btt btu bua bub buc bue buk bus but buu c-- caa cab cac cae cak cas cat cau cba cbb cbc cbe cbk cbs cbt cbu cca ccb ccc cce cck ccs cct ccu ce- cea ceb cec cee cek ces cet ceu cka ckb ckc cks ckt csa csb csc cse csk css cst csu cta ctb ctc cte ctk cts ctt ctu cua cub cuc cue cuk cus cut cuu eaa eab eac eae eak eas eat eau eba ebb ebc ebe ebk ebs ebt ebu ec- eca ecb ecc ece eck ecs ect ecu eea eeb eec eee eek ees eet eka ekb ekc eke eks ekt eku es- esa esb esc ese esk ess est esu eta etb etc ete etk ets ett etu eu- eua eub euc eue eus eut k-t ka- kaa kab kac kae kak kas kat kau kba kbb kbc kbe kbk kbs kbu kca kcb kcc kce kck kcs kct kcu ke- kea keb kec kee kek kes ket kkb kkc kke kkk kks kkt kku ksa ksb ksc kse ksk kss kst ksu kta ktb ktc kte ktk kts ktt ktu kub kuc kue kuk kus kut kuu saa sab sac sae sak sas sat sau sba sbb sbc sbe sbk sbs sbt sbu sca scb scc sce sck scs sct scu se- sea seb sec see sek ses set seu sk- ska skb skc ske skk sks skt sku ss- ssa ssb ssc sse ssk sss sst ssu sta stb stc ste stk sts stt stu sua sub suc sue suk sus sut suu taa tab tac tae tak tas tat tau tba tbb tbc tbe tbk tbs tbt tbu tca tcb tcc tce tck tcs tct tcu te- tea teb tec tee tek tes tet teu tka tkb tkc tke tkk tks tkt tsa tsb tsc tse tsk tss tst tsu tta ttb ttc tte ttk tts ttt ttu tua tub tuc tue tuk tus tut tuu ua- uaa uab uac uae uak uas uat uau uba ubb ubc ube ubk ubs ubt ubu uca ucb ucc uce uck ucs uct ucu uea ueb uec uee ues uet uka ukb ukc uke ukk uku usa usb usc use usk uss ust usu uta utb utc ute utk uts utt utu uua uuc uue uus uut uuu