bbbb bblb bffl bftt bibb bibi bibl bibo biff bifi bili bill bilo bilt bilu bio- bioi biol biot biou bito bitt bitu blbt blio blit blob bloo blot blou blub bluf blut bobb bobi bobo bobu boff bofu boi- boii boil boit boiu boli boll bolo bolt bolu boob boof bool boot botb boti boto bott bouf boul bout btob bttb bubb bubi bubo bubu buff bufo buif buit buiu bulb buli bull bult bulu buol but- buti buto butt ffff ffii fftf fiff fifi fifo fift fiii fiil fili fill filo fiti fitt flii flit flob floo flot flou flub fluf fluo fobt fofo foil foli foll folo folt foof fool foot foti foto fott foul fout ft-l ftii ftlb ftub fubb fubu fuff fufu fuil fuit fuli full fulu futi futo futu ibfi ibot ibtb ibtl ifbb ifil ifit ifto iiii iiio iiit iioi iioo iitt ilio ilit ill- illi illo illt iloo ilot ilut iobi ioii ioio ioit iolo ioof iooi iooo iotf ioto itif itil itll itof itoi itol itoo itou ittf itto iuiu libo libu liff lifl lifo lift liii lilb lili lill lilo lilt lilu lio- litb liti litl lito litt litu liuf liut llll lloo lob- lobb lobi lobo loff lofi loft loif loit loiu loli loll lolo loob loof lool loot loti lotl loto lott loui loul lout louu ltbf ltbl ltib luff luft lufu luif luit luli lull lulu luti obbo obit oblu oboi obol obot off- offo offu ofit oiii oiti olbo olib olio olit olli ollo olof olot oltu oobi ooff oolo oooo ootb otif otit oto- otof otoo otti otto ottu ouff ouii ouit oulu out- outb outi outo ouu- tbil tbit tfot tibi tibu tiff tifo tift tiit tiiu till tilo tilt tiou titi tito titt titu tlli tobi tobo tobt tobu toff tofi tofo toft tofu toil toit tol- toli toll tolo tolt tolu toof tool toot toti toto tott toui toul tout ttbb ttff tttt ttul tubb tubo tubu tuff tufi tufo tuft tufu tuil tuit tuiu tuli tull tulo tulu tuti tutl tuto tutt tutu tuuo ubbi ubbo ubii ubit ubli ublo ubtf ulft ulli ullo ulo- ulti ulto ultt ulul uofl uofo utfo util utti utto uttu uulu uutf uuuu