bbbb bblb bffl bftt bibb bibi bibl biff bifi bili bill bilt bilu bitt bitu blbt blit blub bluf blut bttb bubb bubi bubu buff buif buit buiu bulb buli bull bult bulu but- buti butt ffff ffii fftf fiff fifi fift fiii fiil fili fill fiti fitt flii flit flub fluf ft-l ftii ftlb ftub fubb fubu fuff fufu fuil fuit fuli full fulu futi futu ibfi ibtb ibtl ifbb ifil ifit iiii iiit iitt ilit ill- illi illt ilut itif itil itll ittf iuiu libu liff lifl lift liii lilb lili lill lilt lilu litb liti litl litt litu liuf liut llll ltbf ltbl ltib luff luft lufu luif luit luli lull lulu luti tbil tbit tibi tibu tiff tift tiit tiiu till tilt titi titt titu tlli ttbb ttff tttt ttul tubb tubu tuff tufi tuft tufu tuil tuit tuiu tuli tull tulu tuti tutl tutt tutu ubbi ubii ubit ubli ubtf ulft ulli ulti ultt ulul util utti uttu uulu uutf uuuu