bbbb bblb bibb bibi bibl bili bill bilt bilu bitt bitu blbt blim blit blub blum blut bmmi bttb bubb bubi bubu buit buiu bulb buli bull bult bulu bum- bumb but- buti butt ibbm ibim ibml ibtb ibtl iiii iiit iitm iitt iium ilbm ilit ill- illi illt ilum ilut imbi imit imli immi immt itil itim itll itum iuiu libu liii lilb lili lill lilt lilu limb limi liml limm limu litb liti litl litt litu liut llll lmii ltbl ltib luit luli lull lulu lumb lumi luti mbim miii miit mili mill milt milu mim- mimi mit- mitb miti mitm mitt mitu miui mlii mlit mltb mmii mmli mmmm mtlb mubi muil muit muli mull mulm mult mulu mumm mumu muti mutt mutu muut tbil tbit tibi tibu tiit tiiu till tilt timi timm timu titi titt titu tium tlli tmil tmtt ttbb ttim ttml tttt ttul tubb tubu tuil tuim tuit tuiu tuli tull tulu tumb tumi tumu tuti tutl tutt tutu tuum ubbi ubii ubit ubli uiml ulim ulli ulmi ulmu ulti ultt ulul ulum umb- umbi umit umut util utmb utti uttu uulu uuuu