bbbb bbrg bibb bibi bibo bigb bigg bigo bigt bio- biog bioi biot birb birg biri biro birr birt bito bitt bitz bizz bobb bobi bobo bogg bogi bogo bogt boi- boii boit boob boog boor boot booz bor- borg bori boro borr bort borz botb boti boto bott bozi bozo brig brio brit briz brob brog broo bror brot broz brrr btob btor btrt bttb bzzt bzzz gbbo ggbt gggg gibb gibz gigg gigi gigo giog gioi girg giri giro girr girt gito gizi gizo gizz gobi gobo gogi gogo goit goog gooi goor goot gorb gorg gori goro gorr gort gorz goti goto gott gozi gozo grbr grib grig grit griz grob grog groi groo gror grot grrr gtbr i-go ibot ibri ibro ibtb igbo igoo igor igot igri iiii iiio iiit iioi iioo iitr iitt iobi iogt ioii ioio ioit iooi iooo iorg iori ioto iri- irig irio irob irri irti itgo itoi itoo itor itri itto izzo obbo obit oboi obor obot obri obro ogb oggi ogiz ogog ogoi ogri ogro oigo oiii oirt oiti oitz oobi oooo oort ootb oozi orbb orbi orbo orgo ori- orig orio orit oro- oror orot oroz orri orro orto orzo otit oto- otog otoo otor otro otti otto otzi rbbb rbbr rgbi rgit rgtr rib- ribo rigg rigi rigo riot rioz riri riti rito ritt ritz rizi rizz rob- robb robi robo robt rogg rogi rogo roig roio roir roit roiz roob roog rooi roor root rooz rori roro rort rotg roti roto rotr rott rozi rozz rrrr tbit tbrb tibi tigi tigr tiit tirb tiri tiro tirr titi tito titt titz tizi tizz tobi tobo tobt togo togr togt toit toor toot torg tori toro torr tort toti toto totr tott tozo tri- trib trig trio trit triz trog troi troo trot trtr ttbb tttt tzzt z-ro zibo zigg zigi zigo ziri ziro ziti zito zizi zizz zobo zogg zogi zogo zoio zoo- zoot zorb zorg zori zoro zort zoti zott zotz zozo zzzz