-ic a-a a-b a-c a-i a-t aaa aab aac aai aam aas aat ab- aba abb abc abi abm abs abt ac- aca acb acc aci acm acs act ai- aia aib aic aii aim ais ait ama amb amc ami amm ams amt as- asa asb asc asi asm ass ast at- ata atb atc ati atm ats att baa bab bac bai bam bas bat bba bbb bbc bbi bbm bbs bbt bca bcb bcc bci bcm bcs bct bi- bia bib bic bii bim bis bit bma bmb bmc bmi bmm bms bmt bsa bsb bsc bsi bsm bss bst bta btb btc bti btm bts btt c-- caa cab cac cai cam cas cat cba cbb cbc cbi cbm cbs cbt cca ccb ccc cci ccm ccs cct ci- cia cib cic cii cim cis cit cma cmb cmc cmi cmm cms cmt csa csb csc csi csm css cst cta ctb ctc cti ctm cts ctt ia- iaa iab iac iai iam ias iat iba ibb ibc ibi ibm ibs ibt ica icb icc ici icm ics ict iia iib iic iii iim iis iit im- ima imb imc imi imm ims imt is- isa isb isc isi ism iss ist ita itb itc iti itm its itt maa mab mac mai mam mas mat mba mbb mbc mbi mbm mbs mbt mc- mca mcb mcc mci mcm mcs mct mi- mia mib mic mii mim mis mit mma mmb mmc mmi mmm mms mmt msa msb msc msi msm mss mst mta mtb mtc mti mtm mts mtt saa sab sac sai sam sas sat sba sbb sbc sbi sbm sbs sbt sca scb scc sci scm scs sct sia sib sic sii sim sis sit sma smb smc smi smm sms smt ss- ssa ssb ssc ssi ssm sss sst sta stb stc sti stm sts stt taa tab tac tai tam tas tat tba tbb tbc tbi tbm tbs tbt tca tcb tcc tci tcm tcs tct tia tib tic tii tim tis tit tma tmb tmc tmi tmm tms tmt tsa tsb tsc tsi tsm tss tst tta ttb ttc tti ttm tts ttt