dumbo udmbo dmubo mdubo umdbo mudbo dubmo udbmo dbumo bdumo ubdmo budmo dmbuo mdbuo dbmuo bdmuo mbduo bmduo umbdo mubdo ubmdo bumdo mbudo bmudo dumob udmob dmuob mduob umdob mudob duomb udomb doumb odumb uodmb oudmb dmoub mdoub domub odmub modub omdub umodb muodb uomdb oumdb moudb omudb dubom udbom dbuom bduom ubdom budom duobm udobm doubm odubm uodbm oudbm dboum bdoum dobum odbum bodum obdum ubodm buodm uobdm oubdm boudm obudm dmbou mdbou dbmou bdmou mbdou bmdou dmobu mdobu dombu odmbu modbu omdbu dbomu bdomu dobmu odbmu bodmu obdmu mbodu bmodu mobdu ombdu bomdu obmdu umbod mubod ubmod bumod mbuod bmuod umobd muobd uombd oumbd moubd omubd ubomd buomd uobmd oubmd boumd obumd mboud bmoud mobud ombud bomud obmud
Note: these 'words' (valid or invalid) are all the permutations of the word dumbo. These words are obtained by scrambling the letters in dumbo.