bbbb bbrg bibb bibi bigb bigg bigu birb birg biri birr biru biry brig brrr brug bry- bubb bubi bubu bugg bugi buir buiu bur- burb burg buri burr buru bury buyi buyu bygg gggg gibb giby gigg gigi girg giri girr giru giry giur grbr grib grig grrr grub grug grui grur gry- gubb gubi gubu guby gugb gugg gugi gugu guib gurb gurg guri gurr guru gury guyu gyr- gyri gyuu i-by ibri ibuy ibyi iggy igri iiii irby iri- irig iriy irri iuiu rbbb rbbr rgbi rib- ribu riby rigg rigi rigu rigy riri rrrr rubb rubi rubu ruby rugg rugi ruri ruru ruyi ubbi ubii ubir ugri ugur uguu uirr urbi urgi urgu urib uriu urri urry urur uuri uuuu uyir ybry yirb yirr yubu yugg yugi yugu yuri yury yuyu yyyy