bbbb bbgm bbmg bbrg bibb bibi bigb bigg bigu birb birg biri birr biru bmir bmmi brig brim brrm brrr brug brum bubb bubi bubu bugg bugi buir buiu bum- bumb bur- burb burg buri burm burr buru gggg gibb gigg gigi girg giri girr giru giur gmmr grbr grib grig grim grrr grub grug grui grum grur gubb gubi gubu gugb gugg gugi gugu guib gumb gumi gumm gurb gurg guri gurr guru ibbm ibim ibri igri iiii iium imbi imir immi imri imrr irbm irgm iri- irig irri iuiu mbim mgrm migg migi migu miii mim- mimi mirg miri mirr miru miui mmii mmmm mrbb mrbm mubi mugg mugi mugu muir mumm mumu murg muri murr muru rbbb rbbr rgbi rib- ribu rigg rigi rigu rimi rimm rimu riri rmrg rrrr rrum rubb rubi rubu rugg rugi rumb rumi rumm ruri ruru ubbi ubii ubir ugri ugur uguu uirr umb- umbi ummg umri urbi urgi urgu urib urim uriu urmi urri urum urur uuri uuuu