purr puru put- puti puto putt putu puuc rccc rcdc rcic rcid rcnr rcon rcpd rcpi rcpo rcpt rcrd rctc rcti rdio rdoc rdpc ricc rico rict ridc ridd ridi rido riin rind rinn rino rion riot riou ripd ripi ripp ripr ript riri riti rito ritt ritu rnco rncp rndc rndp rnin rnnt rnod rnot rntd rntp rnut rocc roco rodd rodi rodo roid roin roio roir roit roiu ronc rond roni rono ront rood rooi roon roop roor root ropo rorc rori roro rort roru rotc roti rotn roto rotr rott roud roun roup rout rpdp rpii rpon rppn rptd rptn rrrr rrun rtcc rtdt rtnd rttp ruci ruct rudd rudi rudo rudp ruid ruin ruit runc rund runi runn runo runt rupp rupt rurc rurd ruri ruro rurp ruru ruti ruto rutt rutu ruud ruun tccc tccu tcdd tcnn tcon tcpo tctc tdor tdri ticc tico tidc tidd tiit tiiu tinc tind tini tinn tino tint tinu tion tiop tiou tip- tipc tipi tipo tipp tipt tipu tird tiri tiro tirr tiru titc titi tito titp titt titu tncc tndd tnut toci toco todd todi todo todt todu toid toit toni tonn tono tonu tood toon toor toot top- topd topi topo topp topt topu torc tord tori torn toro torp torr tort toru totc totd toti toto totr tott toui toun toup tour tout tpcd tpcp tpdu tpir tpon tppd tppp tppr tptp tptr tput trcc tri- tric trin trio trip trit trno troc trod troi tron troo trop trot trou trpc trpn trpp trtc trtr truc trud trun trut truu ttcn ttcp tton ttop tttt tucc tuco tudi tudu tuin tuit tuiu tunc tund tuni tunn tuno tunu tuor tupi tupo tupu turc turd turi turn turo turp turr turt turu tuti tuto tutt tutu tuuo u-rp ucci uccp ucdc ucdd ucin ucio ucon ucrc ucut uddi udic udid udin udir udon udoo udop udot udpd udun uint uipi uirr uncc unci unco uncp unct undi undo uni- unic unii unin unio unir unit unni unno unon unop unpc unro unto unut uocc uor- upci updo upic upin upnp upon upor uppc uppp uppu upri upto upup urci urdu uric urin uriu urni uro- uroo urpo urri urun urup urur urut utid utin utor utpd utri utti utto uttu uucp uuni uuno uuoc uuri uuuu