rends ernds rneds nreds enrds nerds redns erdns rdens drens edrns derns rndes nrdes rdnes drnes ndres dnres endrs nedrs ednrs denrs nders dners rensd ernsd rnesd nresd enrsd nersd resnd ersnd rsend srend esrnd sernd rnsed nrsed rsned srned nsred snred ensrd nesrd esnrd senrd nserd snerd redsn erdsn rdesn dresn edrsn dersn resdn ersdn rsedn sredn esrdn serdn rdsen drsen rsden srden dsren sdren edsrn desrn esdrn sedrn dsern sdern rndse nrdse rdnse drnse ndrse dnrse rnsde nrsde rsnde srnde nsrde snrde rdsne drsne rsdne srdne dsrne sdrne ndsre dnsre nsdre sndre dsnre sdnre endsr nedsr ednsr densr ndesr dnesr ensdr nesdr esndr sendr nsedr snedr edsnr desnr esdnr sednr dsenr sdenr ndser dnser nsder snder dsner sdner
Note: these 'words' (valid or invalid) are all the permutations of the word rends. These words are obtained by scrambling the letters in rends.