ffff ffii ffrr ffss ffun fiff fifi fiii fini finn fins firn firs fisi fiss fisu fnrs fnuf frin fris frns frun fsfi fssf fuff fufu fuir funf funs fur- furi furn furr furs fusi fuss fusu ifis ifni ifnr ifns ifrf ifri iiii iiis iirs iisi iisr iisu infi infs inis inni innr inns innu inri inrs inss insu inui inun inus irfu iri- irin iris irri irrs irsf irun irus isin isis isri issf issi issr isss issu isus iuiu iuss n-ii nfff nfrs nfsr nfsu niff niir niiu nini nins nirs niru nisi niss nisu niur nnnn nnss nsfs nsin nsis nsnr nssf nssr nsss nuff nuin nunn nuns nuri nurn nurr nurs nuru nusi nuss nusu riff rifs rifu riif riin riis rinf rinn riri rirs risi riss risu rius rnin rrif rrrr rrun rsis rsnn rsnr ruff ruif ruin ruis runf runi runn runs ruri rurs ruru rusi russ rusu ruun s-ii sfss sfsu siff sifr sifu sini sinn sins sinu sirf siri sirr sirs siru sisi siss sisu siui sius snfu snir snns snrs snur snus srfi sris srni srnn ssin ssis ssns ssri ssrs sssf sssi ssss suf- suff sufi sufr sufs sufu suin suir suis sun- suni sunn suns sunu sur- surf suri surn surr surs suru sus- susi suss susu suus uirr uni- unif unii unin unir unis unni unns unrf unrs uns- unus urff urfi urif urin uris uriu urni urns urri ursi urss ursu urun urur urus usfi usfs usif usin usis usnr usnu ussf ussr usss ussu usui usun usus uuni uuri uusi uuuu