-er a-a a-b a-q a-t aaa aab aae aao aaq aar aas aat ab- aba abb abe abo abq abr abs abt aea aeb aee aeo aeq aer aes aet aoa aob aoe aoo aor aos aot aqa aqo aqr aqs aqt ar- ara arb are aro arq arr ars art as- asa asb ase aso asq asr ass ast at- ata atb ate ato atr ats att baa bab bae bao baq bar bas bat bba bbb bbe bbo bbq bbr bbs bbt be- bea beb bee beo beq ber bes bet boa bob boe boo boq bor bos bot bqe bqt bra brb bre bro brq brr brs brt bsa bsb bse bso bsr bss bst bta btb bte bto btq btr bts btt eaa eab eae eao ear eas eat eba ebb ebe ebo ebq ebr ebs ebt eea eeb eee eeo eer ees eet eo- eoa eob eoe eoo eoq eor eos eot eqa eqe eqq eqs eqt era erb ere ero erq err ers ert es- esa esb ese eso esq esr ess est eta etb ete eto etr ets ett oaa oab oae oao oaq oar oas oat ob- oba obb obe obo obr obs obt oea oeb oee oeo oer oes oet oo- ooa oob ooo oor oos oot oqb oqo or- ora orb ore oro orr ors ort os- osa osb ose oso osq osr oss ost ot- ota otb ote oto otr ots ott qaa qar qas qat qba qbe qbq qbs qee qeo qet qoo qor qos qqq qra qrb qre qrs qrt qsa qso qsr qst qta qto qtq qtr qts ra- raa rab rae rao raq rar ras rat rba rbb rbe rbo rbr rbs rbt re- rea reb ree reo req rer res ret roa rob roe roo ror ros rot rqs rra rrb rrq rrr rrs rrt rsa rsb rse rso rsq rsr rss rst rta rtb rte rto rtq rtr rts rtt saa sab sae sao saq sar sas sat sba sbb sbe sbo sbq sbr sbs sbt se- sea seb see seo seq ser ses set soa sob soe soo soq sor sos sot sqa sqq sqr sqs sr- sra srb sre sro srq srr srs srt ss- ssa ssb sse sso ssq ssr sss sst sta stb ste sto stq str sts stt taa tab tae tao taq tar tas tat tba tbb tbe tbo tbr tbs tbt te- tea teb tee teo teq ter tes tet to- toa tob toe too toq tor tos tot tqo tra trb tre tro trq trr trs trt tsa tsb tse tso tsq tsr tss tst tta ttb tte tto ttr tts ttt