bbbb bbrg bibb bibi bibo bigb bigg bigo bio- biog bioi birb birg biri biro birr bobb bobi bobo bogg bogi bogo boi- boii boob boog boor bor- borg bori boro borr brig brio brob brog broo bror brrr gbbo gggg gibb gigg gigi gigo giog gioi girg giri giro girr gobi gobo gogi gogo goog gooi goor gorb gorg gori goro gorr grbr grib grig grob grog groi groo gror grrr i-go ibri ibro igbo igoo igor igri iiii iiio iioi iioo iobi ioii ioio iooi iooo iorg iori iri- irig irio irob irri obbo oboi obor obri obro ogb oggi ogog ogoi ogri ogro oigo oiii oobi oooo orbb orbi orbo orgo ori- orig orio oro- oror orri orro rbbb rbbr rgbi rib- ribo rigg rigi rigo riri rob- robb robi robo rogg rogi rogo roig roio roir roob roog rooi roor rori roro rrrr