bbbb bbrg bibb bibi bibo bigb bigg bigo biko bio- biog bioi birb birg biri birk biro birr bobb bobi bobo bogg bogi bogo boi- boii boki boko boob boog book boor bor- borg bori bork boro borr brig brik brio brkb brob brog brok broo bror brrr gbbo gggg gibb gigg gigi gigo giog gioi girg giri girk giro girr gobi gobo gogi gogo goog gooi gook goor gorb gorg gori goro gorr grbr grib grig grob grog groi grok groo gror grrr i-go ibri ibro igbo igoo igor igri iiii iiio iioi iioo ikig ikki ikko ikoo ikri iobi ioii ioio ioko iooi iooo iorg iori iri- irig irio irki irob irri kbbb kbbg kbbi kbbk kbbo kbbr kbgb kbgg kbgo kbgr kbib kbig kbik kbio kbkb kbkg kbkk kbko kbkr kbob kboi kbok kboo kbrb kbrg kbri kbrk kbro kgbb kgbr kggg kggi kggo kggr kgio kgir kgor kgrb kgrg kgri kgrk kgro kgrr kibb kibg kibi kibo kibr kigo kiii kiik kiki kikk kiko kikr kioi kiok kioo kirb kiri kirk kiro kirr kkbb kkbg kkbi kkbo kkbr kkgb kkgo kkgr kkik kkkk kkob kkoo kkor kkrb kkrk kkro kkrr kobb kobi kobk kobo kobr kogb kogg kogi kogo koii koir kokb koki kokk koko kokr koob koog kooi kook kooo koor korb korg kori kork koro korr krbb krbg krbi krbk krbr krgi krib krik krio krki krkk krko krkr krob krog kroi krok kroo kror krrb krrg krri krrk krro krrr obbo obkb oboi obok obor obri obro ogb oggi ogog ogoi ogri ogro oigo oiii oiko okgo okir okko okok okor okro oobi oooo orbb orbi orbo orgo ori- orig orio orko oro- orok oror orri orro rbbb rbbr rgbi rib- ribo rigg rigi rigo riki rikk riri rob- robb robi robo rogg rogi rogo roig roik roio roir roki rokk roko rokr roob roog rooi rook roor rori rork roro rrrr