bbbb bbbs bbrg bggs bgst bibb bibi bibo bibs bigb bigg bigo bigs bigt biis bio- biog bioi bios biot birb birg biri biro birr birs birt bis- biso biss bist bito bits bitt bobb bobi bobo bobs bogg bogi bogo bogs bogt boi- boii bois boit boob boog boor boos boot bor- borg bori boro borr bors bort bosi boso boss bost botb boti boto bots bott brig brio bris brit brob brog broo bror bros brot brrr brrs brsb brsr brst bsgs bsos bsts btob btor btrt btss bttb gbbo gbbs ggbt gggg ggss gibb gibs gigg gigi gigo gigs giis giog gioi girg giri giro girr girs girt giss gist gito gits gobi gobo gobs gogi gogo gogs gois goit goog gooi goor goos goot gorb gorg gori goro gorr gors gort gosi goso goss gost goti goto gots gott grbr grib grig gris grit grob grog groi groo gror gros grot grrr grrs grss gsis gsos gstr gtbr gtos i-go ibis ibos ibot ibri ibro ibss ibtb ibts igbo iggs igis igoo igor igot igri igso iiii iiio iiis iiit iioi iioo iios iirs iisi iisr iist iitr iitt iobi iogt ioii ioio ioit iooi iooo ioos iorg iori iors ioso ioto irgs iri- irig irio iris irob irri irrs irsg irti irts isbt isis isit iso- isor isos isrg isri issi isso issr isss isti isto istr ists itbs itgo itgs itis itoi itoo itor itos itri itrs itsi itso itto obbo obis obit oboi obor obos obot obri obro obsr obss obst obts ogb oggi ogog ogoi ogri ogro ogsi oigo oiii oios oirt oist oiti oobi oooo ooos oort oosi oost ootb oots orbb orbi orbo orbs orgo orgs ori- orig orio oris orit oro- oror oros orot orri orro orrs orsi orso orto orts osgi osii osis osoi osoo osor osos osro ossb ossi osso osti ostr osts otbs otis otit oto- otog otoo otor otos otro otrs otsg otso otti otto otts rbbb rbbr rbbs rbis rbss rbst rgbi rgit rgtr rgts rib- ribo ribs rigg rigi rigo rigs riis rios riot riri rirs risi riso riss rist riti rito rits ritt rob- robb robi robo robs robt rogg rogi rogo roig roio roir rois roit roob roog rooi roor roos root rori roro rort rosi roso ross rost rotg roti roto rotr rots rott rrrr rsbi rsgb rsis rsos rsts rtgs rtss rtts s-ib s-ii s-os sbbs sbig sbor sbot sbsi sbst sggg sggs sgio sgro sgss sgts sibi sibo sibs sigg sigi sigo sigs siit sior sios siot siri siro sirr sirs sirt sisi siss sist sit- siti sito sits sitt sobo sobr sobs sobt sogi sogo sogs soir sois soit soog soor soos soot sorb sorg sori soro sorr sors sort sosi soso soss sost soto sots srgb srib sris sros srtr ssbr ssgs ssgt ssis ssit ssot ssrg ssri ssrs sssb sssi ssss sstb ssts stbs stgr stib stig stio stir stis stit stob stog stoo stor stos stot stri stro strs stsi stss sttr tbbs tbgs tbit tbrb tbst tgts tibi tibs tigi tigr tigs tiit tios tirb tiri tiro tirr tirs tisb tisi tiso tiss tist titi tito tits titt tobi tobo tobs tobt togo togr togs togt tois toit toor toos toot torg tori toro torr tors tort tosb tosi toso toss tost toti toto totr tots tott tri- trib trig trio tris trit trog troi troo tros trot trsi trst trtr tsgt tsig tsis tsob tsoi tsos tssg tssi tssr tsst tsts ttbb ttss tttt