ffff ffii ffps ffrr ffss fftf fiff fifi fift fiii fipp fips firs fisi fiss fist fisu fiti fits fitt fprf frip fris frit frps frst fsfi fspf fssf fssp ftii ftps ftrs ftsr fuff fufu fuir fuit fur- furi furr furs furt fusi fuss fust fusu futi futs futu ifis ifit ifps ifrf ifri ifsp iiii iiis iiit iipf iirs iisi iisp iisr iist iisu iitr iitt ippf ippr ipri ipsi ipsp ipss ipts ipur ipus iput irfu iri- irip iris irps irri irrs irsf irsp irtf irti irtp irts irus isfp isis isit ispf ispr isps isri isrp issf issi issp issr isss issu isti istp istr ists isup isus itif itis itrf itri itrs itsf itsi itsp itsu ittf itup itur iuiu iupp iuss iust pfff pffr pfft pfis pfit pfps pfui piff pifs piip pipi pipp pips piri pirr pirs piru pisi piss pist pisu pitf piti pitr pits pitt pitu pius ppif pppp ppps pprf ppru ppsf ppss ppts pptt ppur prfs pri- prif prii pris prps prri prrs prsi prss prti prtp prtr pruf prus prut pruu psfs psip psis pspi pspp pspr psps psrp psst psts pstu ptrf ptui puff puft puir puis puit puiu pupi pups pupu pur- puri purp purr purs puru pusi puss pust put- puti puts putt putu riff rifs rift rifu riif riis ripi ripp ripr rips ript riri rirs risi risp riss rist risu riti rits ritt ritu rius rpii rpps rpts rrif rrrr rrsp rsis rsps rstp rsts rstu rtps rtss rttp rtts ruff ruft ruif ruis ruit rupp rupt ruri rurp rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ii sfss sfsu sftp sfts siff sifr sift sifu siit sipi sipp sips sipt sirf siri sirp sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sius siut spfs spip spir spis spit sppf spps spri sprs spsp spss spst sptr spts spui spur spus sput srfi sris srps srpt srsp srtp srtr ssfp ssis ssit sspf ssps sspt ssri ssrs sssf sssi ssss sstp ssts stfu stif stip stir stis stit stpf stpp stps stri strs stru stsf stsi stss sttr stuf stup stur stus stut suf- suff sufi sufr sufs sufu suir suis suit sup- supp supr sups supt sur- surf suri surp surr surs surt suru sus- susi susp suss sust susu suti sutu suus tfpt tfrs tfsi tfss tftp tiff tift tiit tiiu tip- tipi tipp tips tipt tipu tiri tirr tirs tiru tisi tiss tist titi titp tits titt titu tpir tppp tppr tprs tptp tptr tput trfr tri- trif trip tris trit trpp trps trsi trst trtr trus trut truu tsis tsps tspt tssf tssi tssr tsst tsts tsui tsup ttff ttss tttt tuff tufi tuft tufu tuis tuit tuiu tupi tups tupu turf turi turp turr turs turt turu tusi tuss tust tuti tuts tutt tutu u-rp ufip uftp uipi uirr uist uits upis uppp uppu upri upsi upup urff urfi urft urif uris uriu urri ursi urss ursu urts urup urur urus urut usfi usfs usif usip usis uspp usps ussf ussr usss usst ussu usti ustp usts usui usus utis utri utti uttu uuri uusi uutf uuuu