bbbb bbbs bbrg bggs bibb bibi bibs bigb bigg bigs bigu biis birb birg biri birr birs biru bis- biss bisu brig bris brrr brrs brsb brsr brug brus bsgs bubb bubi bubs bubu bugg bugi bugs buir buis buiu bur- burb burg buri burr burs buru busi buss busu buus gbbs gggg ggss gibb gibs gigg gigi gigs giis girg giri girr girs giru giss giur gius grbr grib grig gris grrr grrs grss grub grug grui grur grus gsis gsur gubb gubi gubs gubu gugb gugg gugi gugu guib guis gurb gurg guri gurr gurs guru gusb guss guus ibis ibri ibss ibus iggs igis igri igus iiii iiis iirs iisi iisr iisu irgs iri- irig iris irri irrs irsg irus isis isrg isri issi issr isss issu isus iugs iuiu iuss rbbb rbbr rbbs rbis rbss rgbi rib- ribs ribu rigg rigi rigs rigu riis riri rirs risi riss risu rius rrrr rsbi rsgb rsis rubb rubi rubs rubu rugg rugi rugs ruis ruri rurs ruru rusi russ rusu s-ib s-ii sbbs sbig sbsi sbus sggg sggs sgss sibi sibs sibu sigg sigi sigs siri sirr sirs siru sisi siss sisu siui sius srgb srib sris srub ssbr ssgs ssis ssrg ssri ssrs sssb sssi ssss sub- subb subg subi subs sug- sugg sugi suig suir suis sur- surg suri surr surs suru sus- susi suss susu suus ubbi ubii ubir ubis uggs ugis ugri ugur uguu uirr urbi urbs urgi urgu urib uris uriu urri ursi urss ursu urur urus usbr usbs usis ussb ussr usss ussu usui usus uuri uusi uuuu