bbbb bbrg bibb bibi bibo bigb bigg bigo bio- biog bioi birb birg biri biro birr bizz bobb bobi bobo bogg bogi bogo boi- boii boob boog boor booz bor- borg bori boro borr borz bozi bozo brig brio briz brob brog broo bror broz brrr bzzz gbbo gggg gibb gibz gigg gigi gigo giog gioi girg giri giro girr gizi gizo gizz gobi gobo gogi gogo goog gooi goor gorb gorg gori goro gorr gorz gozi gozo grbr grib grig griz 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 izzo obbo oboi obor obri obro ogb oggi ogiz ogog ogoi ogri ogro oigo oiii oobi oooo oozi orbb orbi orbo orgo ori- orig orio oro- oror oroz orri orro orzo rbbb rbbr rgbi rib- ribo rigg rigi rigo rioz riri rizi rizz rob- robb robi robo rogg rogi rogo roig roio roir roiz roob roog rooi roor rooz rori roro rozi rozz rrrr z-ro zibo zigg zigi zigo ziri ziro zizi zizz zobo zogg zogi zogo zoio zoo- zorb zorg zori zoro zozo zzzz