a-a a-b a-i a-q a-t aaa aab aai aaq aat aay ab- aba abb abi abq abt aby ai- aia aib aii aiq ait aiy aqa aqi aqt at- ata atb ati att ay- aya ayi ayt baa bab bai baq bat bay bba bbb bbi bbq bbt bby bi- bia bib bii bit biy bqt bta btb bti btq btt bty by- bya byi byq byt ia- iaa iab iai iaq iat iba ibb ibi ibt iby iia iib iii iit iqa iqt ita itb iti itq itt ity iya iyt iyy qaa qat qba qbq qit qqq qta qti qtq qty taa tab tai taq tat tay tba tbb tbi tbt tia tib tii tit tiy tta ttb tti ttt tty tya tyt yaa yab yai yat yay ybi yby yii yiq yit yqb yqt yta ytt yyb yyt yyy