nidal indal ndial dnial idnal dinal niadl inadl naidl anidl iandl aindl ndail dnail nadil andil danil adnil idanl dianl iadnl aidnl dainl adinl nidla indla ndila dnila idnla dinla nilda inlda nlida lnida ilnda linda ndlia dnlia nldia lndia dlnia ldnia idlna dilna ildna lidna dlina ldina niald inald naild anild ianld ainld nilad inlad nliad lniad ilnad linad nalid anlid nlaid lnaid alnid lanid ialnd ailnd iland liand alind laind ndali dnali nadli andli danli adnli ndlai dnlai nldai lndai dlnai ldnai naldi anldi nladi lnadi alndi landi dalni adlni dlani ldani aldni ladni idaln dialn iadln aidln dailn adiln idlan dilan ildan lidan dlian ldian ialdn aildn iladn liadn alidn laidn dalin adlin dlain ldain aldin ladin
Note: these 'words' (valid or invalid) are all the permutations of the word nidal. These words are obtained by scrambling the letters in nidal.