a-a a-b aaa aab aad aar aas aay ab- aba abb abd abr abs aby ad- ada adb add adr ads ady ar- ara arb ard arr ars ary as- asa asb asd asr ass asy ay- aya ayd ayr ays baa bab bad bar bas bay bba bbb bbd bbr bbs bby bda bdb bdd bdr bds bdy bra brb brd brr brs bry bsa bsb bsd bsr bss bsy by- bya byd byr bys daa dab dad dar das day dba dbb dbd dbr dbs dby dda ddb ddd ddr dds ddy dra drb drd drr drs dry dsa dsb dsd dsr dss dsy dy- dya dyb dyd dyr dys dyy ra- raa rab rad rar ras ray rba rbb rbd rbr rbs rda rdb rdd rdr rds rdy rra rrb rrd rrr rrs rsa rsb rsd rsr rss ry- rya ryd ryr rys ryy saa sab sad sar sas say sba sbb sbd sbr sbs sby sda sdb sdd sdr sds sdy sr- sra srb srd srr srs sry ss- ssa ssb ssd ssr sss sy- sya syb syd syr sys yaa yab yad yar yas yay ybr ybs yby yda yds ydy yra yrs ysa ysb ysr yss ysy yyb yys yyy