-ism ffff ffii ffrr ffss fiff fifi fifm fiii fimr firm firs fisi fism fiss fisu fmri fmsr fmss frim fris frsm frum fsfi fsim fssf fuff fufu fuir fumi fums fur- furi furm furr furs fusi fuss fusu ifim ifis ifrf ifri iiii iiis iirs iisi iism iisr iisu iium imfi imir immi imms imri imrr imsf imsi imsr imss imsu imus irfm irfu iri- iris irms irri irrs irsf irus isim isis ismi isms isri issf issi issr isss issu isum isus iuiu iums iuss mfri mfrs miff mifi miii miis mim- mimi mims miri mirr mirs miru mis- misi misr miss misu miui mmff mmii mmis mmmm mmms mmrf mmsu mmus mris mrsi msff msfs msmm msms msmu mssf mssi mssm mssr msus muff mufi mufu muir muis mumm mums mumu muri murr murs muru musi muss musu riff rifs rifu riif riis rimi rimm rims rimu riri rirs risi rism riss risu rius rmif rrif rrrr rrum rsis rsum ruff ruif ruis rumi rumm rums ruri rurs ruru rusi russ rusu s-ii sfmm sfss sfsu siff sifr sifu siim simi simm sims sirf siri sirr sirs siru sisi siss sisu siui sium sius smif smis smrf smss smur smus srfi srim sris ssis ssri ssrm ssrs sssf sssi sssm ssss suf- suff sufi sufr sufs sufu suir suis sum- sumi sums sumu sur- surf suri surr surs suru sus- susi suss susu suum suus ufms uims uirr umff umms umri umsu umus urff urfi urif urim uris uriu urmi urri ursi urss ursu urum urur urus usfi usfs usif usim usis usmm usms ussf ussr usss ussu usui usus uuri uusi uuuu