bbbb bbbs bibb bibi bibs biis bis- bisk biss bist bits bitt bskt bsts btss bttb ibis ibss ibtb ibts iiii iiis iiit iisi iist iitt ikki isbt isis isit issi isss isti ists itbs itis itsi kbbb kbbi kbbk kbbs kbbt kbib kbik kbis kbit kbkb kbkk kbsb kbsi kbsk kbss kbst kbtb kbtk kbts kbtt kibb kibi kibs kibt kiii kiik kiis kiit kiki kikk kikt kisi kisk kiss kist kiti kits kitt kkbb kkbi kkbs kkbt kkik kkit kkkk kksi kkss kkst kktk kkts ksbi ksbs ksib ksii ksik ksis ksit kskb kskk ksks kssi ksss ksst kstb ksti kstk ksts kstt ktbb ktbt ktib ktik ktis ktkb ktkk ktks ktkt ktst ktti kttk ktts kttt s-ib s-ii sbbs sbsi sbst sbtk sibi sibs siik siit siki siks sisi sisk siss sist sit- siti sits sitt skik skis skit skss ssis ssit sssb sssi ssss sstb ssts stbs stib stik stis stit stks stsi stss tbbs tbit tbst tibi tibs tiit tiki tisb tisi tiss tist titi tits titt tkts tsis tsks tssi tsst tsts ttbb ttss tttt