-up ddd ddo ddp ddr dds ddt ddu dod doo dop dor dos dot dou dpd dpo dpp dpr dps dpt dpu drd dro drp drr drs drt dru dsd dso dsp dsr dss dst dsu dtd dto dtp dtr dts dtt dtu dud duo dup dur dus dut odd odo odp odr ods odt odu oo- ood ooo oop oor oos oot op- opd opo opp opr ops opt or- ord oro orp orr ors ort oru os- osd oso osp osr oss ost osu ot- otd oto otp otr ots ott otu ou- oud ouo oup our ous out p-p pdd pdo pdp pdr pds pdt pdu pod poo pop por pos pot pou ppd ppo ppp ppr pps ppt ppu prd pro prp prr prs prt pru ps- psd pso psp psr pss pst psu pt- ptd pto ptp ptr pts ptt ptu pud pup pur pus put puu rdd rdo rdp rdr rds rdt rdu rod roo rop ror ros rot rou rpd rpo rpp rpr rps rpt rpu rrd rrp rrr rrs rrt rru rsd rso rsp rsr rss rst rsu rtd rto rtp rtr rts rtt rtu rud ruo rup rur rus rut ruu sdd sdo sdp sdr sds sdt sdu sod soo sop sor sos sot sou spd spo spp spr sps spt spu sr- srd sro srp srr srs srt ss- ssd sso ssp ssr sss sst ssu std sto stp str sts stt stu sud suo sup sur sus sut suu tdd tdo tdp tdr tds tdt tdu to- tod too top tor tos tot tou tpd tpo tpp tpr tps tpt tpu trd tro trp trr trs trt tru tsd tso tsp tsr tss tst tsu ttd tto ttp ttr tts ttt ttu tud tuo tup tur tus tut tuu udd udo udp udr uds udt udu uod uoo uop uor uos uot up- upd upo upp upr ups upt upu ur- urd uro urp urr urs urt uru usd uso usp usr uss ust usu utd uto utp utr uts utt utu uur uus uut uuu