bbbb bbbs bbrg bggs bibb bibi bibo bibs bigb bigg bigo bigs biis bio- biog bioi bios birb birg biri biro birr birs bis- biso biss bobb bobi bobo bobs bogg bogi bogo bogs boi- boii bois boob boog boor boos bor- borg bori boro borr bors bosi boso boss brig brio bris brob brog broo bror bros brrr brrs brsb brsr bsgs bsos gbbo gbbs gggg ggss gibb gibs gigg gigi gigo gigs giis giog gioi girg giri giro girr girs giss gobi gobo gobs gogi gogo gogs gois goog gooi goor goos gorb gorg gori goro gorr gors gosi goso goss grbr grib grig gris grob grog groi groo gror gros grrr grrs grss gsis gsos i-go ibis ibos ibri ibro ibss igbo iggs igis igoo igor igri igso iiii iiio iiis iioi iioo iios iirs iisi iisr iobi ioii ioio iooi iooo ioos iorg iori iors ioso irgs iri- irig irio iris irob irri irrs irsg isis iso- isor isos isrg isri issi isso issr isss obbo obis oboi obor obos obri obro obsr obss ogb oggi ogog ogoi ogri ogro ogsi oigo oiii oios oobi oooo ooos oosi orbb orbi orbo orbs orgo orgs ori- orig orio oris oro- oror oros orri orro orrs orsi orso osgi osii osis osoi osoo osor osos osro ossb ossi osso rbbb rbbr rbbs rbis rbss rgbi rib- ribo ribs rigg rigi rigo rigs riis rios riri rirs risi riso riss rob- robb robi robo robs rogg rogi rogo roig roio roir rois roob roog rooi roor roos rori roro rosi roso ross rrrr rsbi rsgb rsis rsos s-ib s-ii s-os sbbs sbig sbor sbsi sggg sggs sgio sgro sgss sibi sibo sibs sigg sigi sigo sigs sior sios siri siro sirr sirs sisi siss sobo sobr sobs sogi sogo sogs soir sois soog soor soos sorb sorg sori soro sorr sors sosi soso soss srgb srib sris sros ssbr ssgs ssis ssrg ssri ssrs sssb sssi ssss