iiii iiis iiit iirs iisi iisr iist iitr iitt ikki ikri iri- iris irki irks irri irrs irti irts isis isit isri issi issr isss isti istr ists itis itri itrs itsi kiii kiik kiis kiit kiki kikk kikr kikt kiri kirk kirr kirs kirt kisi kisk kisr kiss kist kiti kitr kits kitt kkik kkit kkkk kkrk kkrr kkrs kkrt kksi kksr kkss kkst kktk kkts krik kris krit krki krkk krkr krks krri krrk krrr krrs krrt krsk krsr krss krst krti krtk krtr krts ksii ksik ksir ksis ksit kskk kskr ksks ksrr ksrs ksrt kssi kssr ksss ksst ksti kstk kstr ksts kstt ktik ktis ktkk ktkr ktks ktkt ktri ktrk ktrr ktrs ktrt ktsr ktst ktti kttk kttr ktts kttt riis riki rikk riri rirs risi risk riss rist riti rits ritt rkss rkts rrrr rsis rsts rtss rtts s-ii siik siit siki sikr siks siri sirk sirr sirs sirt sisi sisk siss sist sit- siti sits sitt skik skir skis skit skrt skss sris srtr ssis ssit ssri ssrs sssi ssss ssts stik stir stis stit stks stri strk strs stsi stss sttr tiit tiki tiri tirr tirs tisi tiss tist titi tits titt tkts tri- trik tris trit trsi trst trtr tsis tsks tssi tssr tsst tsts ttss tttt