bbbb bbrg bibb bibi bibo bigb bigg bigo bigt bigu bio- biog bioi biot biou birb birg biri biro birr birt biru bito bitt bitu bobb bobi bobo bobu bogg bogi bogo bogt boi- boii boit boiu boob boog boor boot bor- borg bori boro borr bort boru botb boti boto bott bour bout brig brio brit brob brog broo bror brot brou brrr brug brut btob btor btrt bttb bubb bubi bubo bubu bugg bugi bugo buir buit buiu bur- burb burg buri buro burr burt buru but- buti buto butt gbbo ggbt gggg gibb gigg gigi gigo giog gioi girg giri giro girr girt giru gito giur gobi gobo gogi gogo goit goog gooi goor goot gorb gorg gori goro gorr gort goti goto gott gou- goug gour gout grbr grib grig grit grob grog groi groo gror grot grou grrr grub grug grui grur grut gtbr gubb gubi gubu gugb gugg gugi gugu guib gurb gurg guri guro gurr gurt guru guti guto gutt gutu 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 ioug iri- irig irio irob irri irti itgo itoi itoo itor itou itri itto itur iuiu obbo obit oboi obor obot obri obro ogb oggi ogog ogoi ogou ogri ogro ogui oigo oiii oirt oiti oobi oooo oort ootb orbb orbi orbo orbu orgo ori- orig orio orit oro- oror orot orri orro orto orub otit oto- otog otoo otor otro otti otto ottu otur ouii ouir ouit our- ouro ourt out- outb outi outo ouu- rbbb rbbr rgbi rgit rgtr rib- ribo ribu rigg rigi rigo rigu riot riou riri riti rito ritt ritu rob- robb robi robo robt robu rogg rogi rogo roig roio roir roit roiu roob roog rooi roor root rori roro rort roru rotg roti roto rotr rott roub rout rrrr rubb rubi rubu rugg rugi ruit ruri ruro ruru ruti ruto rutt rutu tbit tbrb tibi tibu tigi tigr tiit tiiu tiou tirb tiri tiro tirr tiru titi tito titt titu tobi tobo tobt tobu togo togr togt toit toor toot torg tori toro torr tort toru toti toto totr tott toug toui tour tout tri- trib trig trio trit trog troi troo trot trou trtr trub trug trut truu ttbb tttt tubb tubo tubr tubu tugg tugu tuig tuit tuiu tuor turb turg turi turo turr turt turu tuti tuto tutt tutu tuuo ubbi ubbo ubii ubir ubit uggo uggt ugri ugro ugur uguu uirr uor- urbi urgi urgu urib uriu uro- uroo urri urur urut utor utri utti utto uttu utug uuri uuuu