-ism ffff ffii ffrr ffss fftf fiff fifi fifm fift fiii fimr firm firs fisi fism fiss fist fisu fiti fits fitt fmri fmsr fmss frim fris frit frsm frst frum fsfi fsim fssf ftii ftrs ftsr fuff fufu fuir fuit fumi fums fur- furi furm furr furs furt fusi fuss fust fusu futi futs futu ifim ifis ifit ifrf ifri iiii iiis iiit iirs iisi iism iisr iist iisu iitm iitr iitt iium imfi imir imit immi imms immt imri imrr imsf imsi imsr imss imst imsu imts imus irfm irfu iri- iris irms irri irrs irsf irtf irti irts irus isim isis isit ismi isms isri issf issi issr isss issu isti istr ists isum isus itif itim itis itms itrf itri itrs itsf itsi itsu ittf itum itur iuiu iums iuss iust mfri mfrs mftf miff mifi miii miis miit mim- mimi mims miri mirr mirs mirt miru mis- misi misr miss mist misu mit- miti mitm mits mitt mitu miui mmff mmii mmis mmmm mmms mmrf mmst mmsu mmts mmus mris mrsi mrtm mrts mrtt msff msfs msft msmm msms msmu msrt mssf mssi mssm mssr msst mstr msts msus mtff mtrr mtss mtst mttr mtts muff mufi mufu muir muis muit mumm mums mumu muri murr murs murt muru musi muss must musu muti muts mutt mutu muut riff rifs rift rifu riif riis rimi rimm rims rimu riri rirs risi rism riss rist risu riti rits ritt ritu rius rmif rmst rmtu rrif rrrr rrum rsis rsts rstu rsum rtfm rtmi rtms rtss rtts ruff ruft ruif ruis ruit rumi rumm rums rumt ruri rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ii sfmm sfss sfsu sfts siff sifr sift sifu siim siit simi simm sims simt sirf siri sirr sirs sirt siru sisi siss sist sisu sit- siti sits sitt situ siui sium sius siut smif smis smit smrf smrt smss smti smtu smur smus smut srfi srim sris srtr ssis ssit ssri ssrm ssrs sssf sssi sssm ssss ssts stfu stif stim stir stis stit stms stmt stri strs stru stsf stsi stsm stss sttr stuf stum stur stus stut suf- suff sufi sufr sufs sufu suir suis suit sum- sumi sums sumu sur- surf suri surr surs surt suru sus- susi suss sust susu suti sutu suum suus tfrs tfsi tfss tiff tift tiit tiiu timi timm tims timu tiri tirr tirs tiru tisi tism tiss tist titi tits titt titu tium tmsi tmtt trfm trfr tri- trif trim tris trit trmi trms trmu trsi trst trtr trus trut truu tsfm tsis tssf tssi tssm tssr tsst tstm tsts tsui tsum ttff ttim ttms ttss tttt tuff tufi tufm tuft tufu tuim tuis tuit tuiu tumi tums tumu turf turi turm turr turs turt turu tusi tusm tuss tust tuti tuts tutt tutu tuum ufms uims uirr uist uits umff umit umms umri umsu umts umus umut urff urfi urft urif urim uris uriu urmi urri ursi urss ursu urts urum urur urus urut usfi usfs usif usim usis usmm usms ussf ussr usss usst ussu usti ustm usts usui usus utis utri utti uttu uuri uusi uutf uuuu