f--k ffff ffii ffrr ffss fftf fiff fifi fift fiii fiki firk firs fisi fisk fiss fist fiti fits fitt frik fris frit frst fsfi fssf ftii ftrs ftsr ifis ifit ifrf ifri iiii iiis iiit iirs iisi iisr iist iitr iitt ikki ikri iri- iris irki irks irri irrs irsf irtf irti irts isis isit iskf isri issf issi issr isss isti istr ists itif itis itrf itri itrs itsf itsi ittf kfff kffk kfir kfis kfit kfri kfrr kfrs kfsi kfsk kfsr kfst kfti kftk kftt kiff kifr kifs kift kiii kiik kiis kiit kikf kiki kikk kikr kikt kirf kiri kirk kirr kirs kirt kisf kisi kisk kisr kiss kist kiti kitr kits kitt kkfi kkfr kkfs kkft kkik kkit kkkk kkrf kkrk kkrr kkrs kkrt kksf kksi kksr kkss kkst kktk kkts krff krfs krft krik kris krit krki krkk krkr krks krrf krri krrk krrr krrs krrt krsf krsk krsr krss krst krti krtk krtr krts ksfi ksfr ksft ksif ksii ksik ksir ksis ksit kskf kskk kskr ksks ksrf ksrr ksrs ksrt kssi kssr ksss ksst ksti kstk kstr ksts kstt ktfi ktfs ktik ktis ktkk ktkr ktks ktkt ktrf ktri ktrk ktrr ktrs ktrt ktsf ktsr ktst kttf ktti kttk kttr ktts kttt riff rifs rift riif riis riki rikk riri rirs risi risk riss rist riti rits ritt rkkf rkss rkts rrif rrrr rsis rsts rtss rtts s-ii sfss sfts siff sifr sift siik siit siki sikr siks sirf siri sirk sirr sirs sirt sisi sisk siss sist sit- siti sits sitt skif skik skir skis skit skrt skss srfi sris srtr ssis ssit ssri ssrs sssf sssi ssss ssts stif stik stir stis stit stks stri strk strs stsf stsi stss sttr tfrs tfsi tfss tiff tift tiit tiki tiri tirr tirs tisi tiss tist titi tits titt tkts trfr tri- trif trik tris trit trsi trst trtr tsis tsks tssf tssi tssr tsst tsts ttff ttss tttt