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eisrres iesrres esirres seirres iserres sierres riseres irseres rsieres srieres isreres sireres erisres reisres eirsres iersres riesres iresres ersires resires esrires serires rseires sreires eisrres iesrres esirres seirres iserres sierres riseres irseres rsieres srieres isreres sireres rrisees rrisees rirsees irrsees rirsees irrsees rrsiees rrsiees rsriees srriees rsriees srriees risrees irsrees rsirees srirees isrrees sirrees risrees irsrees rsirees srirees isrrees sirrees erresis reresis erresis reresis rreesis rreesis erersis reersis eerrsis eerrsis reersis erersis erersis reersis eerrsis eerrsis reersis erersis rreesis rreesis reresis erresis reresis erresis errseis rerseis errseis rerseis rreseis rreseis ersreis resreis esrreis serreis rsereis srereis ersreis resreis esrreis serreis rsereis srereis rrseeis rrseeis rsreeis srreeis rsreeis srreeis eresris reesris eersris eersris reesris eresris erseris reseris esreris sereris rseeris sreeris eesrris eesrris eserris seerris eserris seerris reseris erseris rseeris sreeris esreris sereris eresris reesris eersris eersris reesris eresris erseris reseris esreris sereris rseeris sreeris eesrris eesrris eserris seerris eserris seerris reseris erseris rseeris sreeris esreris sereris rreseis rreseis rerseis errseis rerseis errseis rrseeis rrseeis rsreeis srreeis rsreeis srreeis resreis ersreis rsereis srereis esrreis serreis resreis ersreis rsereis srereis esrreis serreis eriesrs reiesrs eiresrs ieresrs rieesrs ireesrs ereisrs reeisrs eerisrs eerisrs reeisrs ereisrs eiersrs ieersrs eeirsrs eeirsrs ieersrs eiersrs rieesrs ireesrs reiesrs eriesrs ieresrs eiresrs erisers reisers eirsers iersers riesers iresers ersiers resiers esriers seriers rseiers sreiers eisrers iesrers esirers seirers iserers sierers riseers irseers rsieers srieers isreers sireers eresirs reesirs eersirs eersirs reesirs eresirs erseirs reseirs esreirs sereirs rseeirs sreeirs eesrirs eesrirs eserirs seerirs eserirs seerirs reseirs erseirs rseeirs sreeirs esreirs sereirs eiesrrs ieesrrs eeisrrs eeisrrs ieesrrs eiesrrs eiserrs ieserrs esierrs seierrs iseerrs sieerrs eesirrs eesirrs eseirrs seeirrs eseirrs seeirrs ieserrs eiserrs iseerrs sieerrs esierrs seierrs riesers iresers reisers erisers iersers eirsers riseers irseers rsieers srieers isreers sireers resiers ersiers rseiers sreiers esriers seriers iesrers eisrers iserers sierers esirers seirers eriesrs reiesrs eiresrs ieresrs rieesrs ireesrs ereisrs reeisrs eerisrs eerisrs reeisrs ereisrs eiersrs ieersrs eeirsrs eeirsrs ieersrs eiersrs rieesrs ireesrs reiesrs eriesrs ieresrs eiresrs erisers reisers eirsers iersers riesers iresers ersiers resiers esriers seriers rseiers sreiers eisrers iesrers esirers seirers iserers sierers riseers irseers rsieers srieers isreers sireers eresirs reesirs eersirs eersirs reesirs eresirs erseirs reseirs esreirs sereirs rseeirs sreeirs eesrirs eesrirs eserirs seerirs eserirs seerirs reseirs erseirs rseeirs sreeirs esreirs sereirs eiesrrs ieesrrs eeisrrs eeisrrs ieesrrs eiesrrs eiserrs ieserrs esierrs seierrs iseerrs sieerrs eesirrs eesirrs eseirrs seeirrs eseirrs seeirrs ieserrs eiserrs iseerrs sieerrs esierrs seierrs riesers iresers reisers erisers iersers eirsers riseers irseers rsieers srieers isreers sireers resiers ersiers rseiers sreiers esriers seriers iesrers eisrers iserers sierers esirers seirers rrieses rrieses rireses irreses rireses irreses rreises rreises rerises errises rerises errises rierses irerses reirses erirses ierrses eirrses rierses irerses reirses erirses ierrses eirrses rrisees rrisees rirsees irrsees rirsees irrsees rrsiees rrsiees rsriees srriees rsriees srriees risrees irsrees rsirees srirees isrrees sirrees risrees irsrees rsirees srirees isrrees sirrees rresies rresies rersies errsies rersies errsies rrseies rrseies rsreies srreies rsreies srreies resries ersries rseries sreries esrries serries resries ersries rseries sreries esrries serries riesres iresres reisres erisres iersres eirsres riseres irseres rsieres srieres isreres sireres resires ersires rseires sreires esrires serires iesrres eisrres iserres sierres esirres seirres riesres iresres reisres erisres iersres eirsres riseres irseres rsieres srieres isreres sireres resires ersires rseires sreires esrires serires iesrres eisrres iserres sierres esirres seirres
Note: these 'words' (valid or invalid) are all the permutations of the word serries. These words are obtained by scrambling the letters in serries.