a-a a-b a-t aaa aab aae aam aao aas aat ab- aba abb abe abm abo abs abt aea aeb aee aem aeo aes aet ama amb ame amm amo ams amt aoa aob aoe aom aoo aos aot as- asa asb ase asm aso ass ast at- ata atb ate atm ato ats att baa bab bae bam bao bas bat bba bbb bbe bbm bbo bbs bbt be- bea beb bee bem beo bes bet bma bmb bme bmm bmo bms bmt boa bob boe bom boo bos bot bsa bsb bse bsm bso bss bst bta btb bte btm bto bts btt eaa eab eae eam eao eas eat eba ebb ebe ebm ebo ebs ebt eea eeb eee eem eeo ees eet em- ema emb eme emm emo ems emt eo- eoa eob eoe eom eoo eos eot es- esa esb ese esm eso ess est eta etb ete etm eto ets ett m-o maa mab mae mam mao mas mat mba mbb mbe mbm mbo mbs mbt mea meb mee mem meo mes met mma mmb mme mmm mmo mms mmt moa mob moe mom moo mos mot msa msb mse msm mso mss mst mta mtb mte mtm mto mts mtt oaa oab oae oam oao oas oat ob- oba obb obe obm obo obs obt oea oeb oee oem oeo oes oet om- oma omb ome omm omo oms omt oo- ooa oob oom ooo oos oot os- osa osb ose osm oso oss ost ot- ota otb ote otm oto ots ott saa sab sae sam sao sas sat sba sbb sbe sbm sbo sbs sbt se- sea seb see sem seo ses set sma smb sme smm smo sms smt soa sob soe som soo sos sot ss- ssa ssb sse ssm sso sss sst sta stb ste stm sto sts stt taa tab tae tam tao tas tat tba tbb tbe tbm tbo tbs tbt te- tea teb tee tem teo tes tet tma tmb tme tmm tmo tms tmt to- toa tob toe tom too tos tot tsa tsb tse tsm tso tss tst tta ttb tte ttm tto tts ttt