a-a a-b a-i a-t aaa aab aae aai aam aao aas aat ab- aba abb abe abi abm abo abs abt aea aeb aee aei aem aeo aes aet ai- aia aib aie aii aim aio ais ait ama amb ame ami amm amo ams amt aoa aob aoe aoi aom aoo aos aot as- asa asb ase asi asm aso ass ast at- ata atb ate ati atm ato ats att baa bab bae bai bam bao bas bat bba bbb bbe bbi bbm bbo bbs bbt be- bea beb bee bei bem beo bes bet bi- bia bib bie bii bim bio bis bit bma bmb bme bmi bmm bmo bms bmt boa bob boe boi bom boo bos bot bsa bsb bse bsi bsm bso bss bst bta btb bte bti btm bto bts btt eaa eab eae eai eam eao eas eat eba ebb ebe ebi ebm ebo ebs ebt eea eeb eee eem eeo ees eet eia eib eie eii eim eio eis eit em- ema emb eme emi emm emo ems emt eo- eoa eob eoe eoi eom eoo eos eot es- esa esb ese esi esm eso ess est eta etb ete eti etm eto ets ett ia- iaa iab iae iai iam iao ias iat iba ibb ibe ibi ibm ibo ibs ibt ie- iea iee iei iem ies iet iia iib iie iii iim iio iis iit im- ima imb ime imi imm imo ims imt io- ioa iob ioe ioi iom ioo ios iot is- isa isb ise isi ism iso iss ist ita itb ite iti itm ito its itt m-o maa mab mae mai mam mao mas mat mba mbb mbe mbi mbm mbo mbs mbt mea meb mee mei mem meo mes met mi- mia mib mie mii mim mio mis mit mma mmb mme mmi mmm mmo mms mmt moa mob moe moi mom moo mos mot msa msb mse msi msm mso mss mst mta mtb mte mti mtm mto mts mtt o-i oaa oab oae oai oam oao oas oat ob- oba obb obe obi obm obo obs obt oea oeb oee oei oem oeo oes oet oia oib oie oii oim oio ois oit om- oma omb ome omi omm omo oms omt oo- ooa oob ooi oom ooo oos oot os- osa osb ose osi osm oso oss ost ot- ota otb ote oti otm oto ots ott saa sab sae sai sam sao sas sat sba sbb sbe sbi sbm sbo sbs sbt se- sea seb see sei sem seo ses set sia sib sie sii sim sio sis sit sma smb sme smi smm smo sms smt soa sob soe soi som soo sos sot ss- ssa ssb sse ssi ssm sso sss sst sta stb ste sti stm sto sts stt taa tab tae tai tam tao tas tat tba tbb tbe tbi tbm tbo tbs tbt te- tea teb tee tei tem teo tes tet tia tib tie tii tim tio tis tit tma tmb tme tmi tmm tmo tms tmt to- toa tob toe toi tom too tos tot tsa tsb tse tsi tsm tso tss tst tta ttb tte tti ttm tto tts ttt