-ous bbbb bbbs bbrg bggs bibb bibi bibo bibs bigb bigg bigo bigs bigu biis bio- biog bioi bios biou birb birg biri biro birr birs biru bis- biso biss bisu bobb bobi bobo bobs bobu bogg bogi bogo bogs boi- boii bois boiu boob boog boor boos bor- borg bori boro borr bors boru bosi boso boss bosu bour bous brig brio bris brob brog broo bror bros brou brrr brrs brsb brsr brug brus bsgs bsos bubb bubi bubo bubs bubu bugg bugi bugo bugs buir buis buiu bur- burb burg buri buro burr burs buru busi buss busu buus gbbo gbbs gggg ggss gibb gibs gigg gigi gigo gigs giis giog gioi girg giri giro girr girs giru giss giur gius gobi gobo gobs gogi gogo gogs gois goog gooi goor goos gorb gorg gori goro gorr gors gosi goso goss gosu gou- goug gour gous grbr grib grig gris grob grog groi groo gror gros grou grrr grrs grss grub grug grui grur grus gsis gsos gsur gubb gubi gubs gubu gugb gugg gugi gugu guib guis guos gurb gurg guri guro gurr gurs guru gusb guss guus i-go ibis ibos ibri ibro ibss ibus igbo iggs igis igoo igor igri igso igus iiii iiio iiis iioi iioo iios iirs iisi iisr iisu iobi ioii ioio iooi iooo ioos iorg iori iors ioso iosu ioug ious irgs iri- irig irio iris irob irri irrs irsg irus isis iso- isor isos isrg isri issi isso issr isss issu isus iugs iuiu iuss obbo obis oboi obor obos obri obro obsr obss obus ogb oggi ogog ogoi ogou ogri ogro ogsi ogui ogus oigo oiii oios oisu oobi oooo ooos oosi oous orbb orbi orbo orbs orbu orgo orgs ori- orig orio oris oro- oror oros orri orro orrs orsi orso orsu orub orus osgi osii osis osoi osoo osor osos osro ossb ossi osso ossu oubs ouii ouir ouis our- ouro ours ouu- rbbb rbbr rbbs rbis rbss rgbi rib- ribo ribs ribu rigg rigi rigo rigs rigu riis rios riou riri rirs risi riso riss risu rius rob- robb robi robo robs robu rogg rogi rogo roig roio roir rois roiu roob roog rooi roor roos rori roro roru rosi roso ross roub rous rrrr rsbi rsgb rsis rsos rubb rubi rubs rubu rugg rugi rugs ruis ruri ruro rurs ruru rusi ruso russ rusu s-ib s-ii s-os sbbs sbig sbor sbsi sbus sggg sggs sgio sgro sgss sibi sibo sibs sibu sigg sigi sigo sigs sior sios siou siri siro sirr sirs siru sisi siss sisu siui sius sobo sobr sobs sobu sogi sogo sogs soir sois soog soor soos sorb sorg sori soro sorr sors soru sosi soso soss sour sous srgb srib sris sros srub ssbr ssgs ssis ssrg ssri ssrs sssb sssi ssss sub- subb subg subi subo subs sug- sugg sugi sugo suig suio suir suis suor suos sur- surg suri suro surr surs suru sus- susi suso suss susu suus ubbi ubbo ubii ubir ubis ubos uggo uggs ugis ugos ugri ugro ugur uguu uirr uor- urbi urbs urgi urgu urib uris uriu uro- uroo urri ursi urso urss ursu urur urus usbr usbs usgo usis usog usoi usos ussb ussr usss ussu usui usus uuri uusi uuuu