a-a a-b a-i a-t aaa aab aad aai aas aat aay ab- aba abb abd abi abs abt aby ad- ada adb add adi ads adt ady ai- aia aib aid aii ais ait aiy as- asa asb asd asi ass ast asy at- ata atb atd ati ats att ay- aya ayd ayi ays ayt baa bab bad bai bas bat bay bba bbb bbd bbi bbs bbt bby bda bdb bdd bdi bds bdt bdy bi- bia bib bid bii bis bit biy bsa bsb bsd bsi bss bst bsy bta btb btd bti bts btt bty by- bya byd byi bys byt daa dab dad dai das dat day dba dbb dbd dbi dbs dbt dby dda ddb ddd ddi dds ddt ddy di- dia dib did dii dis dit diy dsa dsb dsd dsi dss dst dsy dta dtb dtd dti dts dtt dty dy- dya dyb dyd dys dyy i-d ia- iaa iab iad iai ias iat iba ibb ibd ibi ibs ibt iby ida idb idd idi ids idt idy iia iib iid iii iis iit is- isa isb isd isi iss ist isy ita itb itd iti its itt ity iya iys iyt iyy saa sab sad sai sas sat say sba sbb sbd sbi sbs sbt sby sda sdb sdd sdi sds sdt sdy sia sib sid sii sis sit ss- ssa ssb ssd ssi sss sst sta stb std sti sts stt sty sy- sya syb syd syi sys syt taa tab tad tai tas tat tay tba tbb tbd tbi tbs tbt tda tdb tdd tdi tds tdt tdy tia tib tid tii tis tit tiy tsa tsb tsd tsi tss tst tsy tta ttb ttd tti tts ttt tty tya tyd tys tyt yaa yab yad yai yas yat yay ybi ybs yby yda yds ydt ydy yid yii yis yit ysa ysb ysi yss yst ysy yta ytd yts ytt yyb yys yyt yyy