nulla unlla nlula lnula ulnla lunla nulla unlla nlula lnula ulnla lunla nllua lnlua nllua lnlua llnua llnua ullna lulna ullna lulna lluna lluna nulal unlal nlual lnual ulnal lunal nuall unall naull anull uanll aunll nlaul lnaul nalul anlul lanul alnul ulanl luanl ualnl aulnl launl alunl nulal unlal nlual lnual ulnal lunal nuall unall naull anull uanll aunll nlaul lnaul nalul anlul lanul alnul ulanl luanl ualnl aulnl launl alunl nllau lnlau nllau lnlau llnau llnau nlalu lnalu nallu anllu lanlu alnlu nlalu lnalu nallu anllu lanlu alnlu llanu llanu lalnu allnu lalnu allnu ullan lulan ullan lulan lluan lluan ulaln lualn ualln aulln lauln aluln ulaln lualn ualln aulln lauln aluln llaun llaun lalun allun lalun allun
Note: these 'words' (valid or invalid) are all the permutations of the word nulla. These words are obtained by scrambling the letters in nulla.