-er a-a a-b a-t aaa aab aae aaj aao aar aas aat ab- aba abb abe abj abo abr abs abt aea aeb aee aej aeo aer aes aet aja ajb aje ajj ajo ajr ajs ajt aoa aob aoe aoj aoo aor aos aot ar- ara arb are arj aro arr ars art as- asa asb ase asj aso asr ass ast at- ata atb ate ato atr ats att baa bab bae baj bao bar bas bat bba bbb bbe bbo bbr bbs bbt be- bea beb bee beo ber bes bet bja bjj bjr bjs bjt boa bob boe boj boo bor bos bot bra brb bre brj bro brr brs brt bsa bsb bse bsj bso bsr bss bst bta btb bte bto btr bts btt eaa eab eae eaj eao ear eas eat eba ebb ebe ebj ebo ebr ebs ebt eea eeb eee eeo eer ees eet eja ejo ejt eo- eoa eob eoe eoo eor eos eot era erb ere ero err ers ert es- esa esb ese eso esr ess est eta etb ete etj eto etr ets ett jaa jab jae jaj jao jar jas jat jba jbj jbo jbr jbs jbt jea jeb jee jej jeo jer jes jet jja jjb jjj jjr jjs joa job joe joj joo jor jos jot jra jrb jro jrr jrs jrt jsa jsb jse jsj jso jsr jss jst jta jtb jte jtr jts jtt oaa oab oae oaj oao oar oas oat ob- oba obb obe obj obo obr obs obt oea oeb oee oeo oer oes oet oja ojb oje ojo ojs oo- ooa oob ooo oor oos oot or- ora orb ore oro orr ors ort os- osa osb ose osj oso osr oss ost ot- ota otb ote oto otr ots ott ra- raa rab rae raj rao rar ras rat rba rbb rbe rbo rbr rbs rbt re- rea reb ree reo rer res ret rja rjr roa rob roe roj roo ror ros rot rra rrb rrr rrs rrt rsa rsb rse rsj rso rsr rss rst rta rtb rte rtj rto rtr rts rtt saa sab sae saj sao sar sas sat sba sbb sbe sbj sbo sbr sbs sbt se- sea seb see sej seo ser ses set sja sjb sje sjj sjr sjs sjt soa sob soe soj soo sor sos sot sr- sra srb sre srj sro srr srs srt ss- ssa ssb sse ssj sso ssr sss sst sta stb ste stj sto str sts stt taa tab tae taj tao tar tas tat tba tbb tbe tbj tbo tbr tbs tbt te- tea teb tee tej teo ter tes tet tje tjo tjr tjs to- toa tob toe toj too tor tos tot tra trb tre tro trr trs trt tsa tsb tse tsj tso tsr tss tst tta ttb tte tto ttr tts ttt