bbbb bbbs bkry brkb brrr brrs brsb brsr brus bry- bryk bubb bubs bubu bukk buku buky bur- burb burk burr burs buru bury busk buss busu busy buus buys buyu byrk bysb byss bysy kbbb kbbk kbbr kbbs kbbu kbkb kbkk kbkr kbky kbrb kbrk kbru kbry kbsb kbsk kbsr kbss kbsu kbsy kbub kbuk kbur kbus kbuu kbuy kbyb kbyr kbys kbyu kkbb kkbr kkbs kkkk kkrb kkrk kkrr kkrs kksr kkss kksu kkus kkuu kkys kkyy krbb krbk krbr krkk krkr krks krku krky krrb krrk krrr krrs krry krsk krsr krss krsu krsy kruk krur kryk kryy ksbr ksbs ksby kskb kskk kskr ksks ksku ksky ksrb ksrr ksrs ksry kssr ksss kssu ksub ksuu ksyr ksyy kubb kubr kubs kubu kuby kukk kuks kuku kuky kurb kurk kurr kurs kuru kury kusb kusu kuub kuuk kuur kuuu kuyu kuyy kybb kybr kyby kykk kykr kyks kyky kyrk kyrs kysk kysr kyuk kyur kyus kyuu kyyk kyys kyyy rbbb rbbr rbbs rbss rkss rrrr rubb rubs rubu ruby rukk ruku rurs ruru rusk russ rusu rusy ruys rysy ryuk sbbs sbrk sbus skss skur sky- skyr skys skyy srby srub ssbr ssby ssrs sssb ssss sub- subb subs suks suku suky sur- surr surs suru sury sus- susk suss susu susy suus suyr suyu syrs syry syss syyk ukky ukur urbs urry urss ursu ursy uruk urur urus us-k usbr usbs ussb ussr usss ussu ussy usus uuuu ybbs ybry ysby yssu ysyb yubu yuks yuku yuky yury yuyu yyyy