dnwc ndwc dwnc wdnc nwdc wndc dncw ndcw dcnw cdnw ncdw cndw dwcn wdcn dcwn cdwn wcdn cwdn nwcd wncd ncwd cnwd wcnd cwnd
Note: these 'words' (valid or invalid) are all the permutations of the word dnwc. These words are obtained by scrambling the letters in dnwc.