ddd ddo ddp ddr ddy dod doo dop dor doy dpd dpo dpp dpr drd dro drp drr dry dy- dyd dyo dyp dyr dyy odd odo odp odr oo- ood ooo oop oor op- opd opo opp opr opy or- ord oro orp orr ory oyd oyo p-p pdd pdo pdp pdr pod poo pop por poy ppd ppo ppp ppr prd pro prp prr pry py- pyd pyo pyr rdd rdo rdp rdr rdy rod roo rop ror roy rpd rpo rpp rpr rrd rrp rrr ry- ryd ryo ryr ryy ydo ydy yod yoo yop yor yoy ypd ypo yro yrp yyy