f--k ffff ffii ffrr ffss fftf fiff fifi fifo fift fiii fiki fior fios firk firs fisi fisk fiss fist fiti fits fitt fofo fois foki foof fook foos foot for- fori fork foro forr fors fort fosi foso foss fost foti foto fots fott frik frio fris frit fros frot frso frst fsfi fsfo fssf ftii ftos ftrs ftsr ifis ifit ifor ifrf ifri ifso ifto iiii iiio iiis iiit iioi iioo iios iirs iisi iisr iist iitr iitt ikki ikko ikoo ikri ioii ioio ioit ioko ioof iooi iooo ioos iori iors ioso iotf ioto iri- irio iris irki irks irri irrs irsf irtf irti irts isis isit iskf isko iso- isof isok isor isos isri issf issi isso issr isss isti isto istr ists itif itis itko itof itoi itoo itor itos itrf itri itrs itsf itsi itso ittf itto k-os kfff kffk kfio kfir kfis kfit kfok kfoo kfor kfri kfro kfrr kfrs kfsi kfsk kfsr kfst kfti kftk kftt kiff kifr kifs kift kiii kiik kiis kiit kikf kiki kikk kiko kikr kikt kioi kiok kioo kiot kirf kiri kirk kiro kirr kirs kirt kisf kisi kisk kiso kisr kiss kist kiti kito kitr kits kitt kkfi kkfr kkfs kkft kkik kkit kkkk kkoo kkor kkot kkrf kkrk kkro kkrr kkrs kkrt kksf kksi kksr kkss kkst kktk kkts koff kofi kofk kofo koft koii koir koit kokf koki kokk koko kokr koks kooi kook kooo koor koos koot korf kori kork koro korr kors kort kos- kosf kosi koso kosr koss kost koti kotk koto kotr kots kott krff krfo krfs krft krik krio kris krit krki krkk krko krkr krks krof kroi krok kroo kror kros krrf krri krrk krro krrr krrs krrt krsf krsk krsr krss krst krti krtk krto krtr krts ksfi ksfo ksfr ksft ksif ksii ksik ksir ksis ksit kskf kskk ksko kskr ksks ksof ksoi ksok ksoo ksor ksos ksrf ksro ksrr ksrs ksrt kssi ksso kssr ksss ksst ksti kstk ksto kstr ksts kstt ktfi ktfo ktfs ktik ktis ktkk ktko ktkr ktks ktkt ktok ktoo ktor ktot ktrf ktri ktrk ktro ktrr ktrs ktrt ktsf ktso ktsr ktst kttf ktti kttk ktto kttr ktts kttt off- offo offr offs ofik ofit ofor ofst oiii oiko oiks oios oirt oist oiti okir okko okok okor okot okro oksi okso okto ooff oofs oooo ooos oort oosi oost oots orff orfi orfs ori- orif orio oris orit orko oro- orof orok oror oros orot orri orro orrs orsi orsk orso orto orts osii osik osis oski osoi osoo osor osos osro ossi osso osti ostr osts otif otis otit oto- otof otok otoo otor otos otro otrs otso otti otto otts riff rifs rift riif riis riki rikk rios riot riri rirs risi risk riso riss rist riti rito rits ritt rkkf rkos rkss rkts roff rofo roif roik roio roir rois roit roki rokk roko rokr roks roof rooi rook roor roos root rori rork roro rort rosi roso ross rost roti rotk roto rotr rots rott rrif rrrr rsis rsos rsts rtss rtts s-ii s-os sfio sfor sfos sfro sfss sfts siff sifo sifr sift siik siit siki siko sikr siks sior sios siot sirf siri sirk siro sirr sirs sirt sisi sisk siss sist sit- siti sito sits sitt skif skik skio skir skis skit skor skot skrt skss sofi sofo soft soif soik soir sois soit soki sokk soko soof sook soor soos soot sori soro sorr sors sort sosi soso soss sost sotk soto sots srfi sris sros srtr ssis ssit ssot ssri ssrs sssf sssi ssss ssts stif stik stio stir stis stit stks stof stok stoo stor stos stot stri strk stro strs stsf stsi stss sttr tfot tfrs tfsi tfss tiff tifo tift tiit tiki tiko tios tiri tiro tirr tirs tisi tiso tiss tist titi tito tits titt tkof tkos tkts toff tofi tofo toft tois toit toki toko toof took toor toos toot torf tori tork toro torr tors tort tosi tosk toso toss tost toti toto totr tots tott trfr tri- trif trik trio tris trit troi troo tros trot trsi trst trtr tsis tsks tsoi tsos tssf tssi tssr tsst tsts ttff ttss tttt