dddd ddps ddss didi dids didu diii diis dipp dips dipu dird dirr dirs dis- disd disi disp diss dius dpsd dpsu drip drrs drsp drui drup drus druu dsdp dsdr dsip dsps dsri dsrp dsrr dssi dssp dudd duds dudu duid duir duis duri duru dusi duur idid idir idis idps idss idus iiii iiis iirs iisd iisi iisp iisr iisu ipdi ipid ippr ipri ipsi ipsp ipss ipur ipus irdp irds iri- irid irip iris irps irri irrs irsp irus isds isis ispr isps isri isrp issi issp issr isss issu isup isus iuds iuiu iupp iusd iuss pdpr pdrs pdsd pdss pids piip pipi pipp pips piri pirr pirs piru pisd pisi piss pisu pius ppds ppid pppd pppp ppps ppru ppss ppur pri- prid prii pris prpd prps prrd prri prrs prsd prsi prss prud prus pruu psdi psdp psdr psds psid psip psis pspi pspp pspr psps psrd psrp puds pudu puid puir puis puiu pupi pups pupu pur- puri purp purr purs puru pusd pusi puss ridd ridi rids riis ripd ripi ripp ripr rips riri rirs risd risi risp riss risu rius rpdp rpii rpps rrrr rrsp rsdd rsds rsid rsis rsps rudd rudi rudp ruds ruid ruis rupp rurd ruri rurp rurs ruru rusi russ rusu ruud s-ii sdds sdpr sdps sdrs sdss sdsu sidd sidi sidr sids sipi sipp sips siri sirp sirr sirs siru sisd sisi siss sisu siui sius spdp spdr spip spir spis sppd spps sprd spri sprs spsd spsp spss spud spui spur spus sris srps srsd srsp ssdd ssdp ssid ssis ssps ssri ssrs sssi ssss sudd sudi suds suid suir suis sup- supp supr sups sur- surd suri surp surr surs suru sus- susd susi susp suss susu suus u-rp uddi udds udid udir udpd udsd uipi uirr uisd upis uppp uppu upri upsi upup urds urdu uris uriu urri ursi urss ursu urup urur urus usdp usds usip usis uspp usps ussr usss ussu usui usus uuri uusi uuuu