ddd ddo ddr ddt ddy dod doo dor dot doy drd dro drr drt dry dtd dto dtr dtt dty dy- dyd dyo dyr dyy odd odo odr odt oo- ood ooo oor oot or- ord oro orr ort ory ot- otd oto otr ott oyd oyo rdd rdo rdr rdt rdy rod roo ror rot roy rrd rrr rrt rtd rto rtr rtt rty ry- ryd ryo ryr ryy tdd tdo tdr tdt tdy to- tod too tor tot toy trd tro trr trt try ttd tto ttr ttt tty tyd tyo tyr tyt ydo ydt ydy yod yoo yor yot yoy yro yrt ytd yto ytr ytt yyt yyy