risers irsers rsiers sriers isrers sirers riesrs iresrs reisrs erisrs iersrs eirsrs rseirs sreirs resirs ersirs serirs esrirs iserrs sierrs iesrrs eisrrs seirrs esirrs risres irsres rsires srires isrres sirres rirses irrses rrises rrises irrses rirses rsries srries rrsies rrsies srries rsries isrres sirres irsres risres srires rsires rierss irerss reirss erirss ierrss eirrss riress irress rriess rriess irress riress reriss erriss rreiss rreiss erriss reriss ierrss eirrss irerss rierss erirss reirss rseris sreris resris ersris serris esrris rsreis srreis rrseis rrseis srreis rsreis rersis errsis rresis rresis errsis rersis serris esrris sreris rseris ersris resris iserrs sierrs iesrrs eisrrs seirrs esirrs isrers sirers irsers risers sriers rsiers iersrs eirsrs iresrs riesrs erisrs reisrs serirs esrirs sreirs rseirs ersirs resirs risesr irsesr rsiesr sriesr isresr siresr riessr iressr reissr erissr ierssr eirssr rseisr sreisr resisr ersisr serisr esrisr isersr siersr iesrsr eisrsr seirsr esirsr risser irsser rsiser sriser isrser sirser risser irsser rsiser sriser isrser sirser rssier srsier rssier srsier ssrier ssrier issrer sisrer issrer sisrer ssirer ssirer riessr iressr reissr erissr ierssr eirssr risesr irsesr rsiesr sriesr isresr siresr resisr ersisr rseisr sreisr esrisr serisr iesrsr eisrsr isersr siersr esirsr seirsr rsesir sresir ressir erssir sersir esrsir rsseir srseir rsseir srseir ssreir ssreir ressir erssir rsesir sresir esrsir sersir sesrir essrir sserir sserir essrir sesrir isesrr siesrr iessrr eissrr seisrr esisrr isserr siserr isserr siserr ssierr ssierr iessrr eissrr isesrr siesrr esisrr seisrr sesirr essirr sseirr sseirr essirr sesirr risrse irsrse rsirse srirse isrrse sirrse rirsse irrsse rrisse rrisse irrsse rirsse rsrise srrise rrsise rrsise srrise rsrise isrrse sirrse irsrse risrse srirse rsirse rissre irssre rsisre srisre isrsre sirsre rissre irssre rsisre srisre isrsre sirsre rssire srsire rssire srsire ssrire ssrire issrre sisrre issrre sisrre ssirre ssirre rirsse irrsse rrisse rrisse irrsse rirsse risrse irsrse rsirse srirse isrrse sirrse rrsise rrsise rsrise srrise rsrise srrise irsrse risrse isrrse sirrse rsirse srirse rsrsie srrsie rrssie rrssie srrsie rsrsie rssrie srsrie rssrie srsrie ssrrie ssrrie rrssie rrssie rsrsie srrsie rsrsie srrsie srsrie rssrie ssrrie ssrrie rssrie srsrie isrsre sirsre irssre rissre srisre rsisre issrre sisrre issrre sisrre ssirre ssirre irssre rissre isrsre sirsre rsisre srisre srsire rssire ssrire ssrire rssire srsire rierss irerss reirss erirss ierrss eirrss riress irress rriess rriess irress riress reriss erriss rreiss rreiss erriss reriss ierrss eirrss irerss rierss erirss reirss riesrs iresrs reisrs erisrs iersrs eirsrs risers irsers rsiers sriers isrers sirers resirs ersirs rseirs sreirs esrirs serirs iesrrs eisrrs iserrs sierrs esirrs seirrs rirses irrses rrises rrises irrses rirses risres irsres rsires srires isrres sirres rrsies rrsies rsries srries rsries srries irsres risres isrres sirres rsires srires rersis errsis rresis rresis errsis rersis resris ersris rseris sreris esrris serris rrseis rrseis rsreis srreis rsreis srreis ersris resris esrris serris rseris sreris iersrs eirsrs iresrs riesrs erisrs reisrs iesrrs eisrrs iserrs sierrs esirrs seirrs irsers risers isrers sirers rsiers sriers ersirs resirs esrirs serirs rseirs sreirs rsersi srersi resrsi ersrsi serrsi esrrsi rsresi srresi rrsesi rrsesi srresi rsresi rerssi errssi rressi rressi errssi rerssi serrsi esrrsi srersi rsersi ersrsi resrsi rsesri sresri ressri erssri sersri esrsri rsseri srseri rsseri srseri ssreri ssreri ressri erssri rsesri sresri esrsri sersri sesrri essrri sserri sserri essrri sesrri rsrsei srrsei rrssei rrssei srrsei rsrsei rssrei srsrei rssrei srsrei ssrrei ssrrei rrssei rrssei rsrsei srrsei rsrsei srrsei srsrei rssrei ssrrei ssrrei rssrei srsrei rerssi errssi rressi rressi errssi rerssi resrsi ersrsi rsersi srersi esrrsi serrsi rrsesi rrsesi rsresi srresi rsresi srresi ersrsi resrsi esrrsi serrsi rsersi srersi sersri esrsri sresri rsesri erssri ressri sesrri essrri sserri sserri essrri sesrri srseri rsseri ssreri ssreri rsseri srseri erssri ressri esrsri sersri rsesri sresri isersr siersr iesrsr eisrsr seirsr esirsr isresr siresr irsesr risesr sriesr rsiesr ierssr eirssr iressr riessr erissr reissr serisr esrisr sreisr rseisr ersisr resisr isesrr siesrr iessrr eissrr seisrr esisrr isserr siserr isserr siserr ssierr ssierr iessrr eissrr isesrr siesrr esisrr seisrr sesirr essirr sseirr sseirr essirr sesirr isrser sirser irsser risser sriser rsiser issrer sisrer issrer sisrer ssirer ssirer irsser risser isrser sirser rsiser sriser srsier rssier ssrier ssrier rssier srsier ierssr eirssr iressr riessr erissr reissr iesrsr eisrsr isersr siersr esirsr seirsr irsesr risesr isresr siresr rsiesr sriesr ersisr resisr esrisr serisr rseisr sreisr sersir esrsir sresir rsesir erssir ressir sesrir essrir sserir sserir essrir sesrir srseir rsseir ssreir ssreir rsseir srseir erssir ressir esrsir sersir rsesir sresir
Note: these 'words' (valid or invalid) are all the permutations of the word risers. These words are obtained by scrambling the letters in risers.