nseri sneri nesri ensri senri esnri nsrei snrei nrsei rnsei srnei rsnei nersi enrsi nresi rnesi ernsi rensi serni esrni sreni rseni ersni resni nseir sneir nesir ensir senir esnir nsier snier niser inser siner isner neisr enisr niesr inesr einsr iensr seinr esinr sienr isenr eisnr iesnr nsrie snrie nrsie rnsie srnie rsnie nsire snire nisre insre sinre isnre nrise rnise nirse inrse rinse irnse srine rsine sirne isrne risne irsne neris enris nreis rneis ernis renis neirs enirs niers iners einrs ienrs nries rnies nires inres rines irnes erins reins eirns ierns riens irens serin esrin srein rsein ersin resin seirn esirn siern isern eisrn iesrn srien rsien siren isren risen irsen erisn reisn eirsn iersn riesn iresn
Note: these 'words' (valid or invalid) are all the permutations of the word nseri. These words are obtained by scrambling the letters in nseri.