-ic -th a-a a-b a-c a-i a-t aaa aab aac aah aai aat aay ab- aba abb abc abh abi abt aby ac- aca acb acc ach aci act acy aha ahb ahc ahh ahi aht ahy ai- aia aib aic aih aii ait aiy at- ata atb atc ath ati att ay- aya ayc ayh ayi ayt baa bab bac bah bai bat bay bba bbb bbc bbh bbi bbt bby bca bcb bcc bch bci bct bcy bha bhb bhc bhh bhi bht bi- bia bib bic bih bii bit biy bta btb btc bth bti btt bty by- bya byc byh byi byt c-- caa cab cac cah cai cat cay cba cbb cbc cbh cbi cbt cby cca ccb ccc cch cci cct ch- cha chb chc chh chi cht chy ci- cia cib cic cih cii cit cta ctb ctc cth cti ctt cty cya cyb cyc cyt h-i haa hab hac hah hai hat hay hba hbb hbc hbh hbi hbt hby hca hcb hcc hch hci hct hcy hha hhb hhc hhh hhi hht hhy hia hib hic hih hii hit hta htb htc hth hti htt hty hy- hya hyb hyc hyh hyi hyt hyy ia- iaa iab iac iah iai iat iba ibb ibc ibh ibi ibt iby ica icb icc ich ici ict icy iha ihb ihc ihh ihi iht ihy iia iib iic iih iii iit ita itb itc ith iti itt ity iya iyc iyt iyy taa tab tac tah tai tat tay tba tbb tbc tbh tbi tbt tca tcb tcc tch tci tct th- tha thb thc thh thi tht thy tia tib tic tih tii tit tiy tta ttb ttc tth tti ttt tty tya tyc tyt yaa yab yac yah yai yat yay ybc ybi yby yca ycc ych yci ycy yha yhc yhi yht yih yii yit yta ytc yth ytt yyb yyc yyt yyy