crucn rcucn curcn ucrcn ruccn urccn crcun rccun ccrun ccrun rccun crcun cucrn uccrn ccurn ccurn uccrn cucrn ruccn urccn rcucn crucn ucrcn curcn crunc rcunc curnc ucrnc rucnc urcnc crnuc rcnuc cnruc ncruc rncuc nrcuc cunrc ucnrc cnurc ncurc uncrc nucrc runcc urncc rnucc nrucc unrcc nurcc crcnu rccnu ccrnu ccrnu rccnu crcnu crncu rcncu cnrcu ncrcu rnccu nrccu ccnru ccnru cncru nccru cncru nccru rcncu crncu rnccu nrccu cnrcu ncrcu cucnr uccnr ccunr ccunr uccnr cucnr cuncr ucncr cnucr ncucr unccr nuccr ccnur ccnur cncur nccur cncur nccur ucncr cuncr unccr nuccr cnucr ncucr rucnc urcnc rcunc crunc ucrnc curnc runcc urncc rnucc nrucc unrcc nurcc rcnuc crnuc rncuc nrcuc cnruc ncruc ucnrc cunrc uncrc nucrc cnurc ncurc
Note: these 'words' (valid or invalid) are all the permutations of the word crucn. These words are obtained by scrambling the letters in crucn.