-up ddd ddo ddp dds ddt ddu ddy dod doo dop dos dot dou doy dpd dpo dpp dps dpt dpu dsd dso dsp dss dst dsu dsy dtd dto dtp dts dtt dtu dty dud duo dup dus dut duy dy- dyd dyo dyp dys dyu dyy odd odo odp ods odt odu oo- ood ooo oop oos oot op- opd opo opp ops opt opy os- osd oso osp oss ost osu ot- otd oto otp ots ott otu ou- oud ouo oup ous out oyd oyo oys p-p pdd pdo pdp pds pdt pdu pod poo pop pos pot pou poy ppd ppo ppp pps ppt ppu ps- psd pso psp pss pst psu psy pt- ptd pto ptp pts ptt ptu pty pud pup pus put puu puy py- pyd pyo pys pyt pyu sdd sdo sdp sds sdt sdu sdy sod soo sop sos sot sou soy spd spo spp sps spt spu spy ss- ssd sso ssp sss sst ssu std sto stp sts stt stu sty sud suo sup sus sut suu suy sy- syd syp sys syt syu tdd tdo tdp tds tdt tdu tdy to- tod too top tos tot tou toy tpd tpo tpp tps tpt tpu tsd tso tsp tss tst tsu tsy ttd tto ttp tts ttt ttu tty tud tuo tup tus tut tuu tuy tyd tyo typ tys tyt udd udo udp uds udt udu uod uoo uop uos uot up- upd upo upp ups upt upu usd uso usp uss ust usu utd uto utp uts utt utu uty uus uut uuu uyo uys uyu ydo yds ydt ydy yod yoo yop yos yot you yoy ypd ypo yps ypu yso ysp yss yst ysu ysy ytd yto ytp yts ytt ytu yud yuo yup yus yut yuu yuy yys yyt yyu yyy