-ic -th a-a a-b a-c a-i a-t aaa aab aac aah aai aat ab- aba abb abc abh abi abt ac- aca acb acc ach aci act aha ahb ahc ahh ahi aht ai- aia aib aic aih aii ait at- ata atb atc ath ati att baa bab bac bah bai bat bba bbb bbc bbh bbi bbt bca bcb bcc bch bci bct bha bhb bhc bhh bhi bht bi- bia bib bic bih bii bit bta btb btc bth bti btt c-- caa cab cac cah cai cat cba cbb cbc cbh cbi cbt cca ccb ccc cch cci cct ch- cha chb chc chh chi cht ci- cia cib cic cih cii cit cta ctb ctc cth cti ctt h-i haa hab hac hah hai hat hba hbb hbc hbh hbi hbt hca hcb hcc hch hci hct hha hhb hhc hhh hhi hht hia hib hic hih hii hit hta htb htc hth hti htt ia- iaa iab iac iah iai iat iba ibb ibc ibh ibi ibt ica icb icc ich ici ict iha ihb ihc ihh ihi iht iia iib iic iih iii iit ita itb itc ith iti itt taa tab tac tah tai tat tba tbb tbc tbh tbi tbt tca tcb tcc tch tci tct th- tha thb thc thh thi tht tia tib tic tih tii tit tta ttb ttc tth tti ttt