bbbb bblb bbwr bffl bftt bibb bibi bibl bibo biff bifi bili bill bilo bilt bilu bio- bioi biol biot biou birb biri birl biro birr birt biru bito bitt bitu biw- blbt blio blir blit blob bloo blot blou blow blub bluf blur blut blw- bobb bobi bobo bobu bobw boff bofu boi- boii boil boit boiu boli boll bolo bolt bolu boob boof bool boor boot boow bor- borf bori boro borr bort boru borw botb boti boto bott botw bouf boul bour bout bouw bowi bowl bowr bowt brfu bril brio brit brob brol broo bror brot brou brow brrr brut btob btor btrt bttb btwo bubb bubi bubo bubu buff bufo bufr buif buir buit buiu bulb buli bull bult bulu buol bur- burb buri burl buro burr burt buru but- buti buto butt ffff ffii ffrr fftf fftw fiff fifi fifo fift fiii fiil fili fill filo fior fiti fitt flii flit flob floo flor flot flou flow flub fluf fluo flur fobt fofo foil foli foll folo folr folt foof fool foot for- forb fori forl foro forr fort foti foto fott fotw foul four fout fowl frib fril frio frit frob frol frot frou frow frub ft-l ftii ftlb fttw ftub ftwo fubb fubu fuff fufu fuil fuir fuit fuli full fulu fuor fur- furi furl furo furr furt futi futo futu fwiw ibfi ibot ibri ibro ibtb ibtl ifbb ifil ifit ifor ifrb ifrf ifri ifto iiii iiio iiit iioi iioo iitr iitt iiwi ilio ilir ilit ill- illi illo illt iloo ilot ilow ilut ilwu iobi ioii ioio ioit iolo ioof iooi iooo iori iotf ioto irfu iri- iril irio irlb irob irri irtf irti irul itif itil itll itof itoi itol itoo itor itou itrf itri ittf itto itur iuiu iwbf iwfl iwil iwiw lblr lbrt libo libr libu liff lifl lifo lift liii liir lilb lili lill lilo lilt lilu lio- lior liri lirl liro lirr lirt liru litb liti litl lito litr litt litu liuf liut llll lloo lob- lobb lobi lobo loff lofi loft loif loir loit loiu loli loll lolo loob loof lool loor loot lori loro loti lotl loto lotr lott loui loul lour lout louu louw lowb lowi lowl lowr lowt lowu loww lrif lroi lrrr ltbf ltbl ltib lttr luff luft lufu luif luit luli lull lulu luri lurt luti luwi luwo luwr luwu lwbt lwoo lwow obbo obit oblu oboi obol obor obot obri obro off- offo offr offu ofit ofor oiii oirt oiti olbo olib olio olit olli ollo olof olor olot oltu olur oobi ooff oolo oooo oort ootb ootw orbb orbi orbo orbu orff orfi orfu ori- orif oril orio orit orlo orlu oro- orof oror orot orri orro orto orub orwo otif otit oto- otof otoo otor otow otro otti otto ottu otur otwo ouff ouii ouir ouit oulu our- ouro ourt out- outb outi outo ouu- owir owli owlt owow owt- owtt owul owur rbbb rbbr rffl rib- ribo ribu riff rift rifu riif rill rilo rilu riol riot riou riri riti ritl rito ritt ritu riwo rlif rob- robb robi robo robt robu roff rofl rofo roif roil roio roir roit roiu rolf roll rolo rolt roob roof rooi rool roor root rori roro rort roru roti rotl roto rotr rott roub rouf roul rout rowb rowf rowi rowl rowr rowt roww rrif rrrr rtbf rtfb rtlt rubb rubi rubu ruff rufo ruft ruif ruit rull rulo ruri ruro ruru ruti rutl ruto rutt rutu ruwi tbil tbit tbrb tfot tibi tibu tiff tifo tift tiit tiiu till tilo tilr tilt tiou tirb tiri tirl tiro tirr tiru titi tito titt titu tiwi tlli tobi tobo tobt tobu toff tofi tofo toft tofu toil toit tol- toli toll tolo tolt tolu toof tool toor toot torf tori toro torr tort toru toti toto totr tott toui toul tour tout towl trfr tri- trib trif tril trio trit troi troo trot trou trow trtr trub trut truu ttbb ttff tttt ttul tubb tubo tubr tubu tuff tufi tufo tuft tufu tuil tuit tuiu tuli tull tulo tulu tuor turb turf turi turo turr turt turu tuti tutl tuto tutt tutu tuuo twbt twi- twib twit two- twob twof twol twoo twot ubbi ubbo ubii ubir ubit ubli ublo ubtf uirr ulft ulli ullo ullr ulo- ulow ulti ulto ultt ulul uofl uofo uofw uor- urbi urff urfi urft urib urif uriu uro- urol uroo urri urur urut utfo util utor utri utti utto uttu utwo uulu uuri uutf uuuu uwfi wbbb wbbf wbbi wbbl wbbo wbbr wbbt wbbw wbfb wbff wbfi wbfo wbfr wbft wbfw wbib wbif wbil wbio wbiw wblb wblf wbli wbll wblo wblt wblu wblw wbob wboi wbol wbor wbow wbrb wbrf wbri wbrr wbrt wbru wbrw wbtf wbti wbto wbtr wbtt wbtu wbtw wbuf wbui wbul wbut wbuw wbwb wbwi wbwl wbwo wbwt wfbf wfbl wfbr wfbt wfff wfif wfil wfir wfit wfiu wfiw wflb wflf wfli wfll wflo wflr wflt wflw wfob wfor wfot wfrb wfrf wfrl wfro wfru wfrw wftf wftl wftr wftu wftw wful wfur wfwi wfwl wfwo wibb wibf wibi wibl wibr wibt wibw wiff wifi wifl wifo wifr wift wiif wiii wiil wiit wiiu wil- wilb wilf wili will wilo wilt wilw wiob wioi wiol wioo wiot wiou wirb wiri wirl wiro wirr wirt wiru witf witi witr witt witu wiuw wiwf wiwi wiwu wlbb wlbf wlbl wlbr wlbt wlbw wlff wlfl wlfr wlfw wlib wlif wlil wlio wlir wliw wllf wlli wlll wllr wllt wllw wlob wlof wlol wloo wlor wlou wlrb wlro wlrr wlrt wlrw wltb wltf wlti wltl wlto wltr wltt wltu wltw wlub wlur wluw wlwf wlwi wlwl wlwt wobb wobl wobo wobt woff wofl wofr woft woio woir wolb wolf woli woll wolr wolt wolw woob woof wool woot woow worb worf wori worl woro worr wort worw wotb wotl wotr wott wotw woub wouf woul wour wout wouw wowb wowf wowi wowl