nract rnact narct anrct ranct arnct nrcat rncat ncrat cnrat rcnat crnat nacrt ancrt ncart cnart acnrt canrt racnt arcnt rcant crant acrnt carnt nratc rnatc nartc anrtc rantc arntc nrtac rntac ntrac tnrac rtnac trnac natrc antrc ntarc tnarc atnrc tanrc ratnc artnc rtanc tranc atrnc tarnc nrcta rncta ncrta cnrta rcnta crnta nrtca rntca ntrca tnrca rtnca trnca nctra cntra ntcra tncra ctnra tcnra rctna crtna rtcna trcna ctrna tcrna nactr anctr ncatr cnatr acntr cantr natcr antcr ntacr tnacr atncr tancr nctar cntar ntcar tncar ctnar tcnar actnr catnr atcnr tacnr ctanr tcanr ractn arctn rcatn cratn acrtn cartn ratcn artcn rtacn tracn atrcn tarcn rctan crtan rtcan trcan ctran tcran actrn catrn atcrn tacrn ctarn tcarn
Note: these 'words' (valid or invalid) are all the permutations of the word nract. These words are obtained by scrambling the letters in nract.