-up p-p ppp ppr pps ppt ppu prp prr prs prt pru pry ps- psp psr pss pst psu psy pt- ptp ptr pts ptt ptu pty pup pur pus put puu puy py- pyr pys pyt pyu rpp rpr rps rpt rpu rrp rrr rrs rrt rru rsp rsr rss rst rsu rtp rtr rts rtt rtu rty rup rur rus rut ruu ruy ry- ryr rys ryu ryy spp spr sps spt spu spy sr- srp srr srs srt sry ss- ssp ssr sss sst ssu stp str sts stt stu sty sup sur sus sut suu suy sy- syp syr sys syt syu tpp tpr tps tpt tpu trp trr trs trt tru try tsp tsr tss tst tsu tsy ttp ttr tts ttt ttu tty tup tur tus tut tuu tuy typ tyr tys tyt up- upp upr ups upt upu ur- urp urr urs urt uru ury usp usr uss ust usu utp utr uts utt utu uty uur uus uut uuu uys uyu yps ypu yrp yrs yrt yru ysp ysr yss yst ysu ysy ytp ytr yts ytt ytu yup yur yus yut yuu yuy yys yyt yyu yyy