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