bbbb bbrg bibb bibi bigb bigg bigu biku birb birg biri birk birr biru brig brik brkb brrr brug bubb bubi bubu bugg bugi buik buir buiu buki bukk buku bur- burb burg buri burk burr buru gggg gibb gigg gigi giku girg giri girk girr giru giur grbr grib grig grrr grub grug grui grur gubb gubi gubu gugb gugg gugi gugu guib guik gurb gurg guri gurk gurr guru ibri igri iiii ikig ikki ikri iri- irig irki irri iuiu kbbb kbbg kbbi kbbk kbbr kbbu kbgb kbgg kbgr kbib kbig kbik kbiu kbkb kbkg kbkk kbkr kbrb kbrg kbri kbrk kbru kbub kbuk kbur kbuu kgbb kgbr kggg kggi kggr kgir kgrb kgrg kgri kgrk kgrr kibb kibg kibi kibr kibu kiii kiik kiiu kiki kikk kikr kiku kirb kiri kirk kirr kiru kiur kiuu kkbb kkbg kkbi kkbr kkgb kkgr kkik kkkk kkrb kkrk kkrr kkuu krbb krbg krbi krbk krbr krgi krib krik krki krkk krkr krku krrb krrg krri krrk krrr krug krui kruk krur kubb kubr kubu kugb kugr kuik kuki kukk kuku kurb kuri kurk kurr kuru kuub kuuk kuur kuuu rbbb rbbr rgbi rib- ribu rigg rigi rigu riki rikk riku riri rrrr rubb rubi rubu rugg rugi ruki rukk ruku ruri ruru ubbi ubii ubik ubir ugri ugur uguu uirr ukur urbi urgi urgu urib urik uriu urri uruk urur uuri uuuu