cuend ucend ceund ecund uecnd eucnd cuned ucned cnued ncued unced nuced cenud ecnud cneud nceud encud necud uencd euncd unecd nuecd enucd neucd cuedn ucedn ceudn ecudn uecdn eucdn cuden ucden cduen dcuen udcen ducen cedun ecdun cdeun dceun edcun decun uedcn eudcn udecn duecn educn deucn cunde ucnde cnude ncude uncde nucde cudne ucdne cdune dcune udcne ducne cndue ncdue cdnue dcnue ndcue dncue undce nudce udnce dunce nduce dnuce cendu ecndu cnedu ncedu encdu necdu cednu ecdnu cdenu dcenu edcnu decnu cndeu ncdeu cdneu dcneu ndceu dnceu endcu nedcu edncu dencu ndecu dnecu uendc eundc unedc nuedc enudc neudc uednc eudnc udenc duenc edunc deunc undec nudec udnec dunec nduec dnuec enduc neduc ednuc denuc ndeuc dneuc
Note: these 'words' (valid or invalid) are all the permutations of the word cuend. These words are obtained by scrambling the letters in cuend.