-er a-a a-b a-t aaa aab aae aaf aak aar aas aat aau ab- aba abb abe abf abk abr abs abt abu aea aeb aee aef aek aer aes aet aeu af- afa afb afe aff afk afr afs aft afu aka akb ake akk akr aks aku ar- ara arb are arf ark arr ars art aru as- asa asb ase asf ask asr ass ast asu at- ata atb ate atf atr ats att atu au- aua aub aue auf auk aur aus aut b-u baa bab bae baf bak bar bas bat bau bba bbb bbe bbf bbk bbr bbs bbt bbu be- bea beb bee bef bek ber bes bet beu bfa bfb bfe bff bfr bfs bft bfu bka bkb bke bkf bkk bkr bks bkt bra brb bre brf brk brr brs brt bru bsa bsb bse bsf bsk bsr bss bst bsu bta btb bte btf btk btr bts btt btu bua bub bue buf buk bur bus but buu eaa eab eae eaf eak ear eas eat eau eba ebb ebe ebf ebk ebr ebs ebt ebu eea eeb eee eef eek eer ees eet ef- efa efb efe eff efr efs eft eka ekb eke ekf ekr eks ekt eku era erb ere erf erk err ers ert eru es- esa esb ese esf esk esr ess est esu eta etb ete etf etk etr ets ett etu eu- eua eub eue euf eur eus eut faa fab fae faf fak far fas fat fau fba fbb fbe fbf fbk fbr fbs fbt fbu fea feb fee fef fek fer fes fet feu ffa ffe fff ffk ffr ffs fft ffu fka fkb fkf fkk fkt fra frb fre frf frk frr frs frt fru fsa fsb fse fsf fsk fsr fss fst fsu fta ftb fte ftf ftk ftr fts ftt ftu fua fub fue fuf fuk fur fus fut fuu k-t ka- kaa kab kae kaf kak kar kas kat kau kba kbb kbe kbf kbk kbr kbs kbu ke- kea keb kee kef kek ker kes ket kfa kff kfs kfu kkb kke kkk kkr kks kkt kku kra krf krk krr krs krt kru ksa ksb kse ksf ksk ksr kss kst ksu kta ktb kte ktf ktk ktr kts ktt ktu kub kue kuk kur kus kut kuu ra- raa rab rae raf rak rar ras rat rau rba rbb rbe rbf rbk rbr rbs rbt rbu re- rea reb ree ref rek rer res ret reu rfa rfb rfe rff rfk rfr rfs rft rfu rkb rke rkf rkk rks rkt rku rra rrb rrf rrk rrr rrs rrt rru rsa rsb rse rsf rsk rsr rss rst rsu rta rtb rte rtf rtk rtr rts rtt rtu rua rub rue ruf ruk rur rus rut ruu saa sab sae saf sak sar sas sat sau sba sbb sbe sbf sbk sbr sbs sbt sbu se- sea seb see sef sek ser ses set seu sfa sfb sfe sff sfk sfr sfs sft sfu sk- ska skb ske skf skk skr sks skt sku sr- sra srb sre srf srk srr srs srt ss- ssa ssb sse ssf ssk ssr sss sst ssu sta stb ste stf stk str sts stt stu sua sub sue suf suk sur sus sut suu taa tab tae taf tak tar tas tat tau tba tbb tbe tbf tbk tbr tbs tbt tbu te- tea teb tee tef tek ter tes tet teu tfa tfb tfe tff tfk tfr tfs tft tfu tka tkb tke tkk tkr tks tkt tra trb tre trf trk trr trs trt tru tsa tsb tse tsf tsk tsr tss tst tsu tta ttb tte ttf ttk ttr tts ttt ttu tua tub tue tuf tuk tur tus tut tuu ua- uaa uab uae uaf uak uar uas uat uau uba ubb ube ubf ubk ubr ubs ubt ubu uea ueb uee uef uer ues uet ufa ufe uff ufr ufs uft ufu uka ukb uke ukf ukk ukr uku ur- ura urb ure urf urk urr urs urt uru usa usb use usf usk usr uss ust usu uta utb ute utf utk utr uts utt utu uua uue uur uus uut uuu