bbbb bbbs bibb bibi bibs biis birb biri birk birr birs bis- bisk biss brik bris brkb brrr brrs brsb brsr ibis ibri ibss iiii iiis iirs iisi iisr ikki ikri iri- iris irki irks irri irrs isis isri issi issr isss kbbb kbbi kbbk kbbr kbbs kbib kbik kbis kbkb kbkk kbkr kbrb kbri kbrk kbsb kbsi kbsk kbsr kbss kibb kibi kibr kibs kiii kiik kiis kiki kikk kikr kirb kiri kirk kirr kirs kisi kisk kisr kiss kkbb kkbi kkbr kkbs kkik kkkk kkrb kkrk kkrr kkrs kksi kksr kkss krbb krbi krbk krbr krib krik kris krki krkk krkr krks krrb krri krrk krrr krrs krsk krsr krss ksbi ksbr ksbs ksib ksii ksik ksir ksis kskb kskk kskr ksks ksrb ksrr ksrs kssi kssr ksss rbbb rbbr rbbs rbis rbss rib- ribs riis riki rikk riri rirs risi risk riss rkss rrrr rsbi rsis s-ib s-ii sbbs sbrk sbsi sibi sibs siik siki sikr siks siri sirk sirr sirs sisi sisk siss skik skir skis skss srib sris ssbr ssis ssri ssrs sssb sssi ssss