gumad ugmad gmuad mguad umgad mugad guamd ugamd gaumd agumd uagmd augmd gmaud mgaud gamud agmud magud amgud umagd muagd uamgd aumgd maugd amugd gumda ugmda gmuda mguda umgda mugda gudma ugdma gduma dguma udgma dugma gmdua mgdua gdmua dgmua mdgua dmgua umdga mudga udmga dumga mduga dmuga guadm ugadm gaudm agudm uagdm augdm gudam ugdam gduam dguam udgam dugam gadum agdum gdaum dgaum adgum dagum uadgm audgm udagm duagm adugm daugm gmadu mgadu gamdu agmdu magdu amgdu gmdau mgdau gdmau dgmau mdgau dmgau gadmu agdmu gdamu dgamu adgmu dagmu madgu amdgu mdagu dmagu admgu damgu umadg muadg uamdg aumdg maudg amudg umdag mudag udmag dumag mduag dmuag uadmg audmg udamg duamg adumg daumg madug amdug mdaug dmaug admug damug
Note: these 'words' (valid or invalid) are all the permutations of the word gumad. These words are obtained by scrambling the letters in gumad.