ddd ddo ddr dds ddt ddy dod doo dor dos dot doy drd dro drr drs drt dry dsd dso dsr dss dst dsy dtd dto dtr dts dtt dty dy- dyd dyo dyr dys dyy odd odo odr ods odt oo- ood ooo oor oos oot or- ord oro orr ors ort ory os- osd oso osr oss ost ot- otd oto otr ots ott oyd oyo oys rdd rdo rdr rds rdt rdy rod roo ror ros rot roy rrd rrr rrs rrt rsd rso rsr rss rst rtd rto rtr rts rtt rty ry- ryd ryo ryr rys ryy sdd sdo sdr sds sdt sdy sod soo sor sos sot soy sr- srd sro srr srs srt sry ss- ssd sso ssr sss sst std sto str sts stt sty sy- syd syr sys syt tdd tdo tdr tds tdt tdy to- tod too tor tos tot toy trd tro trr trs trt try tsd tso tsr tss tst tsy ttd tto ttr tts ttt tty tyd tyo tyr tys tyt ydo yds ydt ydy yod yoo yor yos yot yoy yro yrs yrt yso ysr yss yst ysy ytd yto ytr yts ytt yys yyt yyy