-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aat aay ab- aba abb abc abi abo abt aby ac- aca acb acc aci aco act acy ai- aia aib aic aii aio ait aiy aoa aob aoc aoi aoo aot at- ata atb atc ati ato att ay- aya ayc ayi ayo ayt baa bab bac bai bao bat bay bba bbb bbc bbi bbo bbt bby bca bcb bcc bci bco bct bcy bi- bia bib bic bii bio bit biy boa bob boc boi boo bot boy bta btb btc bti bto btt bty by- bya byc byi byo byt c-- caa cab cac cai cao cat cay cba cbb cbc cbi cbo cbt cby cca ccb ccc cci cco cct ci- cia cib cic cii cio cit co- coa cob coc coi coo cot coy cta ctb ctc cti cto ctt cty cya cyb cyc cyo cyt ia- iaa iab iac iai iao iat iba ibb ibc ibi ibo ibt iby ica icb icc ici ico ict icy iia iib iic iii iio iit io- ioa iob ioc ioi ioo iot ita itb itc iti ito itt ity iya iyc iyo iyt iyy o-i oaa oab oac oai oao oat ob- oba obb obc obi obo obt oby oc- oca ocb occ oci oco oct oia oib oic oii oio oit oo- ooa oob ooc ooi ooo oot ot- ota otb otc oti oto ott oya oyi oyo taa tab tac tai tao tat tay tba tbb tbc tbi tbo tbt tca tcb tcc tci tco tct tia tib tic tii tio tit tiy to- toa tob toc toi too tot toy tta ttb ttc tti tto ttt tty tya tyc tyo tyt yaa yab yac yai yao yat yay ybc ybi yby yca ycc yci yco ycy yii yio yit yob yoc yoi yoo yot yoy yta ytc yto ytt yyb yyc yyt yyy