craud rcaud carud acrud racud arcud cruad rcuad curad ucrad rucad urcad caurd acurd cuard ucard aucrd uacrd raucd arucd ruacd uracd aurcd uarcd cradu rcadu cardu acrdu racdu arcdu crdau rcdau cdrau dcrau rdcau drcau cadru acdru cdaru dcaru adcru dacru radcu ardcu rdacu dracu adrcu darcu cruda rcuda curda ucrda rucda urcda crdua rcdua cdrua dcrua rdcua drcua cudra ucdra cdura dcura udcra ducra rudca urdca rduca druca udrca durca caudr acudr cuadr ucadr aucdr uacdr cadur acdur cdaur dcaur adcur dacur cudar ucdar cduar dcuar udcar ducar audcr uadcr aducr daucr udacr duacr raudc arudc ruadc uradc aurdc uardc raduc arduc rdauc drauc adruc daruc rudac urdac rduac druac udrac durac audrc uadrc adurc daurc udarc duarc
Note: these 'words' (valid or invalid) are all the permutations of the word craud. These words are obtained by scrambling the letters in craud.