-ic a-a a-b a-c a-i a-t aaa aab aac aai aat aay ab- aba abb abc abi abt aby ac- aca acb acc aci act acy ai- aia aib aic aii ait aiy at- ata atb atc ati att ay- aya ayc ayi ayt baa bab bac bai bat bay bba bbb bbc bbi bbt bby bca bcb bcc bci bct bcy bi- bia bib bic bii bit biy bta btb btc bti btt bty by- bya byc byi byt c-- caa cab cac cai cat cay cba cbb cbc cbi cbt cby cca ccb ccc cci cct ci- cia cib cic cii cit cta ctb ctc cti ctt cty cya cyb cyc cyt ia- iaa iab iac iai iat iba ibb ibc ibi ibt iby ica icb icc ici ict icy iia iib iic iii iit ita itb itc iti itt ity iya iyc iyt iyy taa tab tac tai tat tay tba tbb tbc tbi tbt tca tcb tcc tci tct tia tib tic tii tit tiy tta ttb ttc tti ttt tty tya tyc tyt yaa yab yac yai yat yay ybc ybi yby yca ycc yci ycy yii yit yta ytc ytt yyb yyc yyt yyy