ddd ddo dds ddt ddy dod doo dos dot doy dsd dso dss dst dsy dtd dto dts dtt dty dy- dyd dyo dys dyy odd odo ods odt oo- ood ooo oos oot os- osd oso oss ost ot- otd oto ots ott oyd oyo oys sdd sdo sds sdt sdy sod soo sos sot soy ss- ssd sso sss sst std sto sts stt sty sy- syd sys syt tdd tdo tds tdt tdy to- tod too tos tot toy tsd tso tss tst tsy ttd tto tts ttt tty tyd tyo tys tyt ydo yds ydt ydy yod yoo yos yot yoy yso yss yst ysy ytd yto yts ytt yys yyt yyy