bbbb bbrg bfgf bftt bibb bibi bibo biff bifi bigb bigg bigo bigt bio- biog bioi biot birb birg biri biro birr birt bito bitt bobb bobi bobo boff bogg bogi bogo bogt boi- boii boit boob boof boog boor boot bor- borf borg bori boro borr bort botb boti boto bott brig brio brit brob brog broo bror brot brrr btob btor btrt bttb ffff ffii ffrr fftf fiff fifi fifo fift figg figo fiii fior fiti fitt fobt fofo fogg fogi fogo foof foot for- forb forg fori foro forr fort foti foto fott frib frig frio frit frob frog frot ftii gbbo gfor ggbt ggfg gggg gibb giff gift gigg gigi gigo giog gioi girg giri giro girr girt gito gobi gobo goff gofr gogi gogo goif goit goof goog gooi goor goot gorb gorf gorg gori goro gorr gort goti goto gott grbr grib grif grig grit grob grof grog groi groo gror grot grrr gtbr gtfo i-go ibfi ibot ibri ibro ibtb ifbb ifit ifor ifrb ifrf ifri ifto igbo igoo igor igot igri iiii iiio iiit iioi iioo iitr iitt iobi iogt ioii ioio ioit ioof iooi iooo iorg iori iotf ioto iri- irig irio irob irri irtf irti itgo itif itof itoi itoo itor itrf itri ittf itto obbo obit oboi obor obot obri obro off- offo offr ofgo ofit ofor ogb ogfr oggi ogog ogoi ogri ogro oigo oiii oirt oiti oobi ooff oooo oort ootb orbb orbi orbo orff orfi orgo ori- orif orig orio orit oro- orof oror orot orri orro orto otif otit oto- otof otog otoo otor otro otti otto rbbb rbbr rgbi rgit rgtr rib- ribo riff rift rigg rigi rigo riif riot riri riti rito ritt rob- robb robi robo robt roff rofo rogg rogi rogo roif roig roio roir roit roob roof roog rooi roor root rori roro rort rotg roti roto rotr rott rrif rrrr rtbf rtfb tbit tbrb tfot tgif tibi tiff tifo tift tigi tigr tiit tirb tiri tiro tirr titi tito titt tobi tobo tobt toff tofi tofo toft togo togr togt toit toof toor toot torf torg tori toro torr tort toti toto totr tott trfr tri- trib trif trig trio trit trog troi troo trot trtr ttbb ttff tttt