ersop resop esrop serop rseop sreop erosp reosp eorsp oersp roesp oresp esorp seorp eosrp oesrp soerp oserp rsoep sroep rosep orsep sorep osrep erspo respo esrpo serpo rsepo srepo erpso repso eprso perso rpeso preso espro sepro epsro pesro spero psero rspeo srpeo rpseo prseo spreo psreo erops reops eorps oerps roeps oreps erpos repos epros peros rpeos preos eoprs oeprs epors peors opers poers ropes orpes rpoes proes opres pores esopr seopr eospr oespr soepr osepr espor sepor epsor pesor speor pseor eopsr oepsr eposr peosr opesr poesr soper osper spoer psoer opser poser rsope srope rospe orspe sorpe osrpe rspoe srpoe rpsoe prsoe sproe psroe ropse orpse rpose prose oprse porse sopre ospre spore psore opsre posre
Note: these 'words' (valid or invalid) are all the permutations of the word ersop. These words are obtained by scrambling the letters in ersop.