bbbb bbbs bbrg bffs bfgf bfsi bfsr bfts bftt bggs bgst bibb bibi bibo bibs biff bifi 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 boff bofs bogg bogi bogo bogs bogt boi- boii bois boit boob boof boog boor boos boot bor- borf 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 bsff bsfs bsgs bsos bsts btob btor btrt btss bttb fbis fbrs ffff ffii ffrr ffss fftf fgts fibs fiff fifi fifo fift figg figo figs fiii fior fios firs fisi fiss fist fiti fits fitt fobs fobt fofo fogg fogi fogo fogs fois foof foos foot for- forb forg fori foro forr fors fort fosb fosi foso foss fost foti foto fots fott frib frig frio fris frit frob frog fros frot frsb frso frst fsfi fsfo fsgs fssf ftii ftos ftrs ftsr gbbo gbbs gfor ggbt ggfg gggg ggss gibb gibs giff gifs gift gigg gigi gigo gigs giis giog gioi girg giri giro girr girs girt giss gist gito gits gobi gobo gobs goff gofr gogi gogo gogs goif gois goit goof goog gooi goor goos goot gorb gorf gorg gori goro gorr gors gort gosi goso goss gost goti goto gots gott grbr grib grif grig gris grit grob grof grog groi groo gror gros grot grrr grrs grss gsif gsis gsos gstr gtbr gtfo gtos i-go ibfi ibis ibos ibot ibri ibro ibsf ibss ibtb ibts ifbb ifis ifit ifor ifrb ifrf ifri ifsb ifso ifto 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 ioof iooi iooo ioos iorg iori iors ioso iotf ioto irgs iri- irig irio iris irob irri irrs irsf irsg irtf irti irts isbt isis isit iso- isof isor isos isrg isri issf issi isso issr isss isti isto istr ists itbs itgo itgs itif itis itof itoi itoo itor itos itrf itri itrs itsf itsi itso ittf itto obbo obis obit oboi obor obos obot obri obro obsr obss obst obts off- offo offr offs ofgo ofit ofor ofst ogb ogfr oggi ogog ogoi ogri ogro ogsi oigo oiii oios oirt oist oiti oobi ooff oofs oooo ooos oort oosi oost ootb oots orbb orbi orbo orbs orff orfi orfs orgo orgs ori- orif orig orio oris orit oro- orof 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 otif otis otit oto- otof otog otoo otor otos otro otrs otsg otso otti otto otts rbbb rbbr rbbs rbis rbss rbst rfgs rgbi rgit rgtr rgts rib- ribo ribs riff rifs rift rigg rigi rigo rigs riif riis rios riot riri rirs risi riso riss rist riti rito rits ritt rob- robb robi robo robs robt roff rofo rogg rogi rogo roif roig roio roir rois roit roob roof roog rooi roor roos root rori roro rort rosi roso ross rost rotg roti roto rotr rots rott rrif rrrr rsbi rsgb rsis rsos rsts rtbf rtfb rtgs rtss rtts s-ib s-ii s-os sbbs sbig sbor sbot sbsi sbst sfio sfog sfor sfos sfro sfss sfts sggg sggs sgio sgro sgss sgts sibi sibo sibs siff sifo sifr sift sigg sigi sigo sigs siit sior sios siot sirf siri siro sirr sirs sirt sisi siss sist sit- siti sito sits sitt sobo sobr sobs sobt sofi sofo soft sogi sogo sogs soif soir sois soit soof soog soor soos soot sorb sorg sori soro sorr sors sort sosi soso soss sost soto sots srfi srgb srib sris sros srtr ssbr ssgs ssgt ssis ssit ssot ssrg ssri ssrs sssb sssf sssi ssss sstb ssts stbs stgr stib stif stig stio stir stis stit stob stof stog stoo stor stos stot stri stro strs stsf stsi stss sttr tbbs tbgs tbit tbrb tbst tfot tfrs tfsi tfss tgif tgts tibi tibs tiff tifo tift tigi tigr tigs tiit tios tirb tiri tiro tirr tirs tisb tisi tiso tiss tist titi tito tits titt tobi tobo tobs tobt toff tofi tofo toft togo togr togs togt tois toit toof toor toos toot torf torg tori toro torr tors tort tosb tosi toso toss tost toti toto totr tots tott trfr tri- trib trif trig trio tris trit trog troi troo tros trot trsi trst trtr tsgt tsig tsis tsob tsoi tsos tssf tssg tssi tssr tsst tsts ttbb ttff ttss tttt