ffff ffii ffrr ffss fftf fiff fifi fifo fift fiii fini finn fino fins fint fion fior fios firn firs fisi fiss fist fiti fits fitt fnrs fofo foin fois fono fons font foof foon foos foot for- fori forn foro forr fors fort fosi foso foss fost foti foto fots fott frin frio fris frit frns fron fros frot frso frst fsfi fsfo fssf ftii ftos ftrs ftsr i-no ifis ifit ifni ifno ifnr ifns ifor ifrf ifri ifso iftn ifto iiii iiio iiis iiit iino iioi iioo iios iirs iisi iisr iist iitr iitt infi info infs inis init inni inno innr inns ino- inoi inon inor inos inot inri inro inrs inso inss inst inti intn into intr ints ioii ioio ioit ioni ionn iono ions ioof iooi iooo ioos iori iors ioso iotf ioto iri- irin irio iris iron irri irrs irsf irtf irti irts isin isis isit isno isnt iso- isof ison isor isos isri issf issi isso issr isss isti isto istr ists itif itin itis itno itof itoi iton itoo itor itos itrf itri itrs itsf itsi itso ittf itto n-ii nfff nfon nfrs nfsr nfto niff nift niir niit nini nino nins nion nioo nios niro nirs nirt nisi niso niss nist nitf niti nito nitr nits nnit nnnn nnos nnot nnss nntn nofi noif noin noio noir nois noit non- noni nonn nono nons nont noo- noon nooo noor noos noot nor- norf nori norn noro norr nors nort nos- noss nost not- noti noto nots nott nron nrts nsfs nsin nsis nsnr nsof nsos nssf nsso nssr nsss nsts ntfs ntis ntof ntsf ntss ntto nttr off- offo offr offs ofit ofno ofor ofst oiii oins oint oion oios oirt oist oiti onir onis onit onni onno onon onor onos onso onst ont- onti onto ooff oofs oons oont oooo ooos oort oosi oost oots orff orfi orfs ori- orif orin orio oris orit orni orno orns oro- orof oron oror oros orot orri orro orrs orsi orso orto orts osii osin osis osno osnr osoi osoo osor osos osro ossi osso osti ostr osts otif otin otis otit oto- otof oton otoo otor otos otro otrs otso otti otto otts riff rifs rift riif riin riis rinf rinn rino rion rios riot riri rirs risi riso riss rist riti rito rits ritt rnin rnnt rnot roff rofo roif roin roio roir rois roit roni rono rons ront roof rooi roon roor roos root rori roro rort rosi roso ross rost roti rotn roto rotr rots rott rrif rrrr rsis rsnn rsno rsnr rsos rsts rtns rtss rtts s-ii s-os sfio sfnt sfor sfos sfro sfss sfts siff sifo sifr sift siit sini sinn sino sins sint sion sior sios siot sirf siri siro sirr sirs sirt sisi siss sist sit- siti sitn sito sits sitt snir snit snns snoo snor snos snot snrs sntr sofi sofo soft soif soin soir sois soit son- soni sono sons sont soof soon soor soos soot sori sorn soro sorr sors sort sosi soso soss sost sotn soto sots srfi sris srni srnn srno sros srtr ssin ssis ssit ssns ssot ssri ssrs sssf sssi ssss ssts stfn stif stio stir stis stit stnn stnr stns stof ston stoo stor stos stot stri strn stro strs stsf stsi stss sttr tfin tfot tfrs tfsi tfss tiff tifo tift tiit tini tinn tino tins tint tion tios tiri tiro tirr tirs tisi tiso tiss tist titi tito tits titt tnts toff tofi tofo toft tois toit toni tonn tono tons toof toon toor toos toot torf tori torn toro torr tors tort tosi toso toss tost toti toto totr tots tott trfr tri- trif trin trio tris trit trno troi tron troo tros trot trsi trst trtr tsin tsis tsoi tsos tssf tssi tssr tsst tsts ttff ttfn tton ttss tttt