ddd ddo ddp dds ddy dod doo dop dos doy dpd dpo dpp dps dsd dso dsp dss dsy dy- dyd dyo dyp dys dyy odd odo odp ods oo- ood ooo oop oos op- opd opo opp ops opy os- osd oso osp oss oyd oyo oys p-p pdd pdo pdp pds pod poo pop pos poy ppd ppo ppp pps ps- psd pso psp pss psy py- pyd pyo pys sdd sdo sdp sds sdy sod soo sop sos soy spd spo spp sps spy ss- ssd sso ssp sss sy- syd syp sys ydo yds ydy yod yoo yop yos yoy ypd ypo yps yso ysp yss ysy yys yyy