-up ddd ddo ddp dds ddt ddu dod doo dop dos dot dou dpd dpo dpp dps dpt dpu dsd dso dsp dss dst dsu dtd dto dtp dts dtt dtu dud duo dup dus dut odd odo odp ods odt odu oo- ood ooo oop oos oot op- opd opo opp ops opt os- osd oso osp oss ost osu ot- otd oto otp ots ott otu ou- oud ouo oup ous out p-p pdd pdo pdp pds pdt pdu pod poo pop pos pot pou ppd ppo ppp pps ppt ppu ps- psd pso psp pss pst psu pt- ptd pto ptp pts ptt ptu pud pup pus put puu sdd sdo sdp sds sdt sdu sod soo sop sos sot sou spd spo spp sps spt spu ss- ssd sso ssp sss sst ssu std sto stp sts stt stu sud suo sup sus sut suu tdd tdo tdp tds tdt tdu to- tod too top tos tot tou tpd tpo tpp tps tpt tpu tsd tso tsp tss tst tsu ttd tto ttp tts ttt ttu tud tuo tup tus tut tuu 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 uus uut uuu