-er a-a a-b a-t aaa aab aae aaj aak aao aar aas aat ab- aba abb abe abj abk abo abr abs abt aea aeb aee aej aek aeo aer aes aet aja ajb aje ajj ajk ajo ajr ajs ajt aka akb ake akj akk ako akr aks aoa aob aoe aoj aok aoo aor aos aot ar- ara arb are arj ark aro arr ars art as- asa asb ase asj ask aso asr ass ast at- ata atb ate ato atr ats att baa bab bae baj bak bao bar bas bat bba bbb bbe bbk bbo bbr bbs bbt be- bea beb bee bek beo ber bes bet bja bjj bjk bjr bjs bjt bka bkb bke bkk bko bkr bks bkt boa bob boe boj bok boo bor bos bot bra brb bre brj brk bro brr brs brt bsa bsb bse bsj bsk bso bsr bss bst bta btb bte btk bto btr bts btt eaa eab eae eaj eak eao ear eas eat eba ebb ebe ebj ebk ebo ebr ebs ebt eea eeb eee eek eeo eer ees eet eja ejo ejt eka ekb eke eko ekr eks ekt eo- eoa eob eoe eok eoo eor eos eot era erb ere erk ero err ers ert es- esa esb ese esk eso esr ess est eta etb ete etj etk eto etr ets ett jaa jab jae jaj jak jao jar jas jat jba jbj jbk jbo jbr jbs jbt jea jeb jee jej jek jeo jer jes jet jja jjb jjj jjk jjr jjs jka jkb jkk jko jkr jks jkt joa job joe joj jok joo jor jos jot jra jrb jrk jro jrr jrs jrt jsa jsb jse jsj jsk jso jsr jss jst jta jtb jte jtk jtr jts jtt k-t ka- kaa kab kae kaj kak kao kar kas kat kba kbb kbe kbk kbo kbr kbs ke- kea keb kee kek keo ker kes ket kjb kje kjr kjs kkb kke kkk kkr kks kkt koa kob koe kok koo kor kos kot kra krk kro krr krs krt ksa ksb kse ksk kso ksr kss kst kta ktb kte ktj ktk kto ktr kts ktt oaa oab oae oaj oak oao oar oas oat ob- oba obb obe obj obk obo obr obs obt oea oeb oee oeo oer oes oet oja ojb oje ojo ojs oka okb oke okj okk oko okr oks oo- ooa oob ook ooo oor oos oot or- ora orb ore ork oro orr ors ort os- osa osb ose osj osk oso osr oss ost ot- ota otb ote otk oto otr ots ott ra- raa rab rae raj rak rao rar ras rat rba rbb rbe rbk rbo rbr rbs rbt re- rea reb ree rek reo rer res ret rja rjk rjr rkb rke rkk rko rks rkt roa rob roe roj rok roo ror ros rot rra rrb rrk rrr rrs rrt rsa rsb rse rsj rsk rso rsr rss rst rta rtb rte rtj rtk rto rtr rts rtt saa sab sae saj sak sao sar sas sat sba sbb sbe sbj sbk sbo sbr sbs sbt se- sea seb see sej sek seo ser ses set sja sjb sje sjj sjk sjr sjs sjt sk- ska skb ske skj skk sko skr sks skt soa sob soe soj sok soo sor sos sot sr- sra srb sre srj srk sro srr srs srt ss- ssa ssb sse ssj ssk sso ssr sss sst sta stb ste stj stk sto str sts stt taa tab tae taj tak tao tar tas tat tba tbb tbe tbj tbk tbo tbr tbs tbt te- tea teb tee tej tek teo ter tes tet tje tjo tjr tjs tka tkb tke tkk tko tkr tks tkt to- toa tob toe toj tok too tor tos tot tra trb tre trk tro trr trs trt tsa tsb tse tsj tsk tso tsr tss tst tta ttb tte ttk tto ttr tts ttt