-ic a-a a-b a-c a-i a-t aaa aab aac aai aam aat ab- aba abb abc abi abm abt ac- aca acb acc aci acm act ai- aia aib aic aii aim ait ama amb amc ami amm amt at- ata atb atc ati atm att baa bab bac bai bam bat bba bbb bbc bbi bbm bbt bca bcb bcc bci bcm bct bi- bia bib bic bii bim bit bma bmb bmc bmi bmm bmt bta btb btc bti btm btt c-- caa cab cac cai cam cat cba cbb cbc cbi cbm cbt cca ccb ccc cci ccm cct ci- cia cib cic cii cim cit cma cmb cmc cmi cmm cmt cta ctb ctc cti ctm ctt ia- iaa iab iac iai iam iat iba ibb ibc ibi ibm ibt ica icb icc ici icm ict iia iib iic iii iim iit im- ima imb imc imi imm imt ita itb itc iti itm itt maa mab mac mai mam mat mba mbb mbc mbi mbm mbt mc- mca mcb mcc mci mcm mct mi- mia mib mic mii mim mit mma mmb mmc mmi mmm mmt mta mtb mtc mti mtm mtt taa tab tac tai tam tat tba tbb tbc tbi tbm tbt tca tcb tcc tci tcm tct tia tib tic tii tim tit tma tmb tmc tmi tmm tmt tta ttb ttc tti ttm ttt