-er a-a a-b a-c a-t aaa aab aac aae aak aar aas aat aau ab- aba abb abc abe abk abr abs abt abu ac- aca acb acc ace ack acr acs act acu aea aeb aec aee aek aer aes aet aeu aka akb akc ake akk akr aks aku ar- ara arb arc are ark arr ars art aru as- asa asb asc ase ask asr ass ast asu at- ata atb atc ate atr ats att atu au- aua aub auc aue auk aur aus aut b-u baa bab bac bae bak bar bas bat bau bba bbb bbc bbe bbk bbr bbs bbt bbu bca bcb bcc bce bck bcr bcs bct bcu be- bea beb bec bee bek ber bes bet beu bka bkb bkc bke bkk bkr bks bkt bra brb bre brk brr brs brt bru bsa bsb bsc bse bsk bsr bss bst bsu bta btb btc bte btk btr bts btt btu bua bub buc bue buk bur bus but buu c-- caa cab cac cae cak car cas cat cau cba cbb cbc cbe cbk cbr cbs cbt cbu cca ccb ccc cce cck ccr ccs cct ccu ce- cea ceb cec cee cek cer ces cet ceu cka ckb ckc cks ckt cra crb crc cre crk crr crs crt cru csa csb csc cse csk csr css cst csu cta ctb ctc cte ctk ctr cts ctt ctu cua cub cuc cue cuk cur cus cut cuu eaa eab eac eae eak ear eas eat eau eba ebb ebc ebe ebk ebr ebs ebt ebu ec- eca ecb ecc ece eck ecr ecs ect ecu eea eeb eec eee eek eer ees eet eka ekb ekc eke ekr eks ekt eku era erb erc ere erk err ers ert eru es- esa esb esc ese esk esr ess est esu eta etb etc ete etk etr ets ett etu eu- eua eub euc eue eur eus eut k-t ka- kaa kab kac kae kak kar kas kat kau kba kbb kbc kbe kbk kbr kbs kbu kca kcb kcc kce kck kcr kcs kct kcu ke- kea keb kec kee kek ker kes ket kkb kkc kke kkk kkr kks kkt kku kra krc krk krr krs krt kru ksa ksb ksc kse ksk ksr kss kst ksu kta ktb ktc kte ktk ktr kts ktt ktu kub kuc kue kuk kur kus kut kuu ra- raa rab rac rae rak rar ras rat rau rba rbb rbc rbe rbk rbr rbs rbt rbu rca rcb rcc rce rcr rcs rct rcu re- rea reb rec ree rek rer res ret reu rkb rkc rke rkk rks rkt rku rra rrb rrc rrk rrr rrs rrt rru rsa rsb rsc rse rsk rsr rss rst rsu rta rtb rtc rte rtk rtr rts rtt rtu rua rub ruc rue ruk rur rus rut ruu saa sab sac sae sak sar sas sat sau sba sbb sbc sbe sbk sbr sbs sbt sbu sca scb scc sce sck scr scs sct scu se- sea seb sec see sek ser ses set seu sk- ska skb skc ske skk skr sks skt sku sr- sra srb src sre srk srr srs srt ss- ssa ssb ssc sse ssk ssr sss sst ssu sta stb stc ste stk str sts stt stu sua sub suc sue suk sur sus sut suu taa tab tac tae tak tar tas tat tau tba tbb tbc tbe tbk tbr tbs tbt tbu tca tcb tcc tce tck tcr tcs tct tcu te- tea teb tec tee tek ter tes tet teu tka tkb tkc tke tkk tkr tks tkt tra trb trc tre trk trr trs trt tru tsa tsb tsc tse tsk tsr tss tst tsu tta ttb ttc tte ttk ttr tts ttt ttu tua tub tuc tue tuk tur tus tut tuu ua- uaa uab uac uae uak uar uas uat uau uba ubb ubc ube ubk ubr ubs ubt ubu uca ucb ucc uce uck ucr ucs uct ucu uea ueb uec uee uer ues uet uka ukb ukc uke ukk ukr uku ur- ura urb urc ure urk urr urs urt uru usa usb usc use usk usr uss ust usu uta utb utc ute utk utr uts utt utu uua uuc uue uur uus uut uuu