rdent drent rednt erdnt dernt edrnt rdnet drnet rndet nrdet dnret ndret rendt erndt rnedt nredt enrdt nerdt denrt ednrt dnert ndert endrt nedrt rdetn dretn redtn erdtn dertn edrtn rdten drten rtden trden dtren tdren retdn ertdn rtedn tredn etrdn terdn detrn edtrn dtern tdern etdrn tedrn rdnte drnte rndte nrdte dnrte ndrte rdtne drtne rtdne trdne dtrne tdrne rntde nrtde rtnde trnde ntrde tnrde dntre ndtre dtnre tdnre ntdre tndre rentd erntd rnetd nretd enrtd nertd retnd ertnd rtend trend etrnd ternd rnted nrted rtned trned ntred tnred entrd netrd etnrd tenrd nterd tnerd dentr edntr dnetr ndetr endtr nedtr detnr edtnr dtenr tdenr etdnr tednr dnter ndter dtner tdner ntder tnder entdr netdr etndr tendr ntedr tnedr
Note: these 'words' (valid or invalid) are all the permutations of the word rdent. These words are obtained by scrambling the letters in rdent.