a-a a-b a-t aaa aab aad aar aas aat aay ab- aba abb abd abr abs abt aby ad- ada adb add adr ads adt ady ar- ara arb ard arr ars art ary as- asa asb asd asr ass ast asy at- ata atb atd atr ats att ay- aya ayd ayr ays ayt baa bab bad bar bas bat bay bba bbb bbd bbr bbs bbt bby bda bdb bdd bdr bds bdt bdy bra brb brd brr brs brt bry bsa bsb bsd bsr bss bst bsy bta btb btd btr bts btt bty by- bya byd byr bys byt daa dab dad dar das dat day dba dbb dbd dbr dbs dbt dby dda ddb ddd ddr dds ddt ddy dra drb drd drr drs drt dry dsa dsb dsd dsr dss dst dsy dta dtb dtd dtr dts dtt dty dy- dya dyb dyd dyr dys dyy ra- raa rab rad rar ras rat ray rba rbb rbd rbr rbs rbt rda rdb rdd rdr rds rdt rdy rra rrb rrd rrr rrs rrt rsa rsb rsd rsr rss rst rta rtb rtd rtr rts rtt rty ry- rya ryd ryr rys ryy saa sab sad sar sas sat say sba sbb sbd sbr sbs sbt sby sda sdb sdd sdr sds sdt sdy sr- sra srb srd srr srs srt sry ss- ssa ssb ssd ssr sss sst sta stb std str sts stt sty sy- sya syb syd syr sys syt taa tab tad tar tas tat tay tba tbb tbd tbr tbs tbt tda tdb tdd tdr tds tdt tdy tra trb trd trr trs trt try tsa tsb tsd tsr tss tst tsy tta ttb ttd ttr tts ttt tty tya tyd tyr tys tyt yaa yab yad yar yas yat yay ybr ybs yby yda yds ydt ydy yra yrs yrt ysa ysb ysr yss yst ysy yta ytd ytr yts ytt yyb yys yyt yyy