a-a a-b a-t aaa aab aad aao aar aas aat aay ab- aba abb abd abo abr abs abt aby ad- ada adb add ado adr ads adt ady aoa aob aod aoo aor aos aot ar- ara arb ard aro arr ars art ary as- asa asb asd aso asr ass ast asy at- ata atb atd ato atr ats att ay- aya ayd ayo ayr ays ayt baa bab bad bao bar bas bat bay bba bbb bbd bbo bbr bbs bbt bby bda bdb bdd bdo bdr bds bdt bdy boa bob bod boo bor bos bot boy bra brb brd bro brr brs brt bry bsa bsb bsd bso bsr bss bst bsy bta btb btd bto btr bts btt bty by- bya byd byo byr bys byt daa dab dad dao dar das dat day dba dbb dbd dbo dbr dbs dbt dby dda ddb ddd ddo ddr dds ddt ddy doa dob dod doo dor dos dot doy dra drb drd dro drr drs drt dry dsa dsb dsd dso dsr dss dst dsy dta dtb dtd dto dtr dts dtt dty dy- dya dyb dyd dyo dyr dys dyy oaa oab oad oao oar oas oat ob- oba obb obd obo obr obs obt oby oda odb odd odo odr ods odt oo- ooa oob ood ooo oor oos oot or- ora orb ord oro orr ors ort ory os- osa osb osd oso osr oss ost ot- ota otb otd oto otr ots ott oya oyd oyo oys ra- raa rab rad rao rar ras rat ray rba rbb rbd rbo rbr rbs rbt rda rdb rdd rdo rdr rds rdt rdy roa rob rod roo ror ros rot roy rra rrb rrd rrr rrs rrt rsa rsb rsd rso rsr rss rst rta rtb rtd rto rtr rts rtt rty ry- rya ryd ryo ryr rys ryy saa sab sad sao sar sas sat say sba sbb sbd sbo sbr sbs sbt sby sda sdb sdd sdo sdr sds sdt sdy soa sob sod soo sor sos sot soy sr- sra srb srd sro srr srs srt sry ss- ssa ssb ssd sso ssr sss sst sta stb std sto str sts stt sty sy- sya syb syd syr sys syt taa tab tad tao tar tas tat tay tba tbb tbd tbo tbr tbs tbt tda tdb tdd tdo tdr tds tdt tdy to- toa tob tod too tor tos tot toy tra trb trd tro trr trs trt try tsa tsb tsd tso tsr tss tst tsy tta ttb ttd tto ttr tts ttt tty tya tyd tyo tyr tys tyt yaa yab yad yao yar yas yat yay ybr ybs yby yda ydo yds ydt ydy yob yod yoo yor yos yot yoy yra yro yrs yrt ysa ysb yso ysr yss yst ysy yta ytd yto ytr yts ytt yyb yys yyt yyy