bbbb bbbs bibb bibi bibs biis birb biri birk birr birs biry bis- bisk biss bisy biys bkry brik bris brkb brrr brrs brsb brsr bry- bryk byik byki byrk bysb bysi byss bysy i-by ibis ibri ibss ibyi iiii iiis iirs iisi iisr ikki ikky ikri irby iri- iris iriy irki irks irri irrs isis isri issi issr isss issy isys kbbb kbbi kbbk kbbr kbbs kbib kbik kbis kbiy kbkb kbkk kbkr kbky kbrb kbri kbrk kbry kbsb kbsi kbsk kbsr kbss kbsy kbyb kbyi kbyr kbys kibb kibi kibr kibs kiby kiii kiik kiis kiki kikk kikr kirb kiri kirk kirr kirs kisi kisk kisr kiss kisy kiyi kiyk kiys kkbb kkbi kkbr kkbs kkik kkkk kkrb kkrk kkrr kkrs kksi kksr kkss kkys kkyy krbb krbi krbk krbr krib krik kris krki krkk krkr krks krky krrb krri krrk krrr krrs krry krsk krsr krss krsy kryk kryy ksbi ksbr ksbs ksby ksib ksii ksik ksir ksis ksiy kskb kskk kskr ksks ksky ksrb ksrr ksrs ksry kssi kssr ksss ksyr ksyy kybb kybi kybr kyby kyis kykk kykr kyks kyky kyrk kyrs kysk kysr kyyi kyyk kyys kyyy rbbb rbbr rbbs rbis rbss rib- ribs riby riis riki rikk riri rirs risi risk riss rkss rrrr rsbi rsis ryis ryki rysy s-ib s-ii sbbs sbrk sbsi sibi sibs siby siik siki sikr siks siri sirk sirr sirs sisi sisk siss sisy siyi skik skir skis skss sky- skyr skys skyy srby srib sris ssbr ssby ssis ssri ssrs sssb sssi ssss syik syis syrs syry syss syyk ybbs ybry yirb yirk yirr yisk yiss ysby ysii ysyb yyyy