a-a a-b a-i a-t aaa aab aai aam aas aat ab- aba abb abi abm abs abt ai- aia aib aii aim ais ait ama amb ami amm ams amt as- asa asb asi asm ass ast at- ata atb ati atm ats att baa bab bai bam bas bat bba bbb bbi bbm bbs bbt bi- bia bib bii bim bis bit bma bmb bmi bmm bms bmt bsa bsb bsi bsm bss bst bta btb bti btm bts btt ia- iaa iab iai iam ias iat iba ibb ibi ibm ibs ibt iia iib iii iim iis iit im- ima imb imi imm ims imt is- isa isb isi ism iss ist ita itb iti itm its itt maa mab mai mam mas mat mba mbb mbi mbm mbs mbt mi- mia mib mii mim mis mit mma mmb mmi mmm mms mmt msa msb msi msm mss mst mta mtb mti mtm mts mtt saa sab sai sam sas sat sba sbb sbi sbm sbs sbt sia sib sii sim sis sit sma smb smi smm sms smt ss- ssa ssb ssi ssm sss sst sta stb sti stm sts stt taa tab tai tam tas tat tba tbb tbi tbm tbs tbt tia tib tii tim tis tit tma tmb tmi tmm tms tmt tsa tsb tsi tsm tss tst tta ttb tti ttm tts ttt