bbbb bbbs bboy bbyo bffs bfsi bfsr bfts bftt bibb bibi bibo bibs biff bifi biis bio- bioi bios biot birb biri biro birr birs birt biry bis- biso biss bist bisy bito bits bitt biys bobb bobi bobo bobs boby boff bofs boi- boii bois boit boob boof boor boos boot bor- borf bori boro borr bors bort bory bosi boso boss bost botb boti boto bots bott boty boyf boyi boyo boys brio bris brit brob broo bror bros brot brrr brrs brsb brsr brst bry- bryo bsff bsfs bsos bsts btob btor btrt btry btss bttb byit byob byoi byos byrt bysb bysi byso byss byst bysy byts fbis fbrs ffff ffii ffrr ffss fftf fibs fiff fifi fifo fift fiii fior fios firs firy fisi fiss fist fiti fits fitt fobs fobt fofo fois foof foos foot for- forb fori foro forr fors fort fosb fosi foso foss fost foti foto fots fott foty foys foyt frib frio fris frit frob fros frot frsb frso frst frys fsfi fsfo fssf ftfy ftii ftos ftrs ftsr fyfi fyrs fyry fyti i-by ibfi ibis ibos ibot ibri ibro ibsf ibss ibtb ibts ibyi ifbb ifby iffy ifis ifit ifor ifrb ifrf ifri ifsb ifso ifto ifyo iiii iiio iiis iiit iioi iioo iios iirs iisi iisr iist iitr iitt iobi ioby ioii ioio ioit ioof iooi iooo ioos iori iors ioso iotf ioto irby iri- irio iris iriy irob irri irrs irsf irtf irti irts isbt isis isit iso- isof isor isos isri issf issi isso issr isss issy isti isto istr ists isty isys itbs itby itif itis itof itoi itoo itor itos itrf itri itrs itry itsf itsi itso itsy ittf itto itty iyos obbo obby obis obit oboi obor obos obot oboy obri obro obsr obss obst obts off- offo offr offs offy ofit ofor ofst oiii oios oirt oiry oist oiti oobi ooby ooff oofs oofy oooo ooos oort oory oosi oost ootb oots ooty orbb orbi orbo orbs orby orff orfi orfs ori- orif orio oris orit oro- orof oror oros orot oroy orri orro orrs orry orsi orso orsy orto orts orys osby osii osis osoi osoo osor osos osro ossb ossi osso ossy osti ostr osts osyt otbs otif otis otit oto- otof otoo otor otos otoy otro otrs otry otso otti otto otts otyr oyri oyss oyst rbbb rbbr rbbs rbis rbss rbst rib- ribo ribs riby riff rifs rift riif riis rios riot riri rirs risi riso riss rist riti rito rits ritt riyf riyo rob- robb robi robo robs robt roby roff rofo roif roio roir rois roit roob roof rooi roor roos root rori roro rort rory rosi roso ross rost rosy roti roto rotr rots rott roty roys royt rrif rrrr rsbi rsis rsos rsts rtbf rtfb rtss rtts ryff ryft ryif ryis ryob ryot rysy rytt ryyf ryyt s-ib s-ii s-os sbbs sbor sbot sbsi sbst sfio sfor sfos sfro sfss sfts sibi sibo sibs siby siff sifo sifr sift sify siit sior sios siot sirf siri siro sirr sirs sirt sisi siss sist sisy sit- siti sito sits sitt sity siyi sobo sobr sobs sobt sofi sofo soft soif soir sois soit soof soor soos soot sooy sorb sori soro sorr sors sort sory sosi soso soss sost soto sots soyo soys soyt srby srfi srib sris sros srtr ssbr ssby ssis ssit ssot ssri ssrs sssb sssf sssi ssss sstb ssts stbs stib stif stio stir stis stit stob stof stoo stor stos stot stoy stri stro strs stry stsf stsi stss sttr styf styr stys sybo syff syfy syis syro syrs syrt syry syso syss syst sytt tbbs tbit tbrb tbst tbyf tfot tfrs tfsi tfss tibi tibs tiff tifo tift tiit tios tirb tiri tiro tirr tirs tiry tisb tisi tiso tiss tist titi tito tits titt tiyi tiyo to-y tobi tobo tobs tobt toby toff tofi tofo toft tois toit toof toor toos toot torf tori toro torr tors tort tory tosb tosi toso toss tost tosy toti toto totr tots tott toty toyb toyo toys toyt trfr tri- trib trif trio tris trit troi troo tros trot troy trsi trst trtr try- tryb tryo trys tsis tsob tsoi tsos tsoy tssf tssi tssr tsst tsts tsys ttbb ttff ttoy ttss tttt ttys tybi tybo tyff tyft tyir tyr- tyrf tyro tyrr tyss tyst tyti tyto tytt tyty ybbs ybor ybry yiff yift yirb yirr yiss yist yiti yobi yobo yobs yoff yoit yoof yoot yori yoro yort yory yosi yoso yost yott yoyo yrof ysby ysii ysyb yyff yyyy