frists rfists firsts ifrsts rifsts irfsts frsits rfsits fsrits sfrits rsfits srfits fisrts ifsrts fsirts sfirts isfrts sifrts risfts irsfts rsifts srifts isrfts sirfts fritss rfitss firtss ifrtss riftss irftss frtiss rftiss ftriss tfriss rtfiss trfiss fitrss iftrss ftirss tfirss itfrss tifrss ritfss irtfss rtifss trifss itrfss tirfss frstis rfstis fsrtis sfrtis rsftis srftis frtsis rftsis ftrsis tfrsis rtfsis trfsis fstris sftris ftsris tfsris stfris tsfris rstfis srtfis rtsfis trsfis strfis tsrfis fistrs ifstrs fsitrs sfitrs isftrs siftrs fitsrs iftsrs ftisrs tfisrs itfsrs tifsrs fstirs sftirs ftsirs tfsirs stfirs tsfirs istfrs sitfrs itsfrs tisfrs stifrs tsifrs ristfs irstfs rsitfs sritfs isrtfs sirtfs ritsfs irtsfs rtisfs trisfs itrsfs tirsfs rstifs srtifs rtsifs trsifs strifs tsrifs istrfs sitrfs itsrfs tisrfs stirfs tsirfs frisst rfisst firsst ifrsst rifsst irfsst frsist rfsist fsrist sfrist rsfist srfist fisrst ifsrst fsirst sfirst isfrst sifrst risfst irsfst rsifst srifst isrfst sirfst frisst rfisst firsst ifrsst rifsst irfsst frsist rfsist fsrist sfrist rsfist srfist fisrst ifsrst fsirst sfirst isfrst sifrst risfst irsfst rsifst srifst isrfst sirfst frssit rfssit fsrsit sfrsit rsfsit srfsit frssit rfssit fsrsit sfrsit rsfsit srfsit fssrit sfsrit fssrit sfsrit ssfrit ssfrit rssfit srsfit rssfit srsfit ssrfit ssrfit fissrt ifssrt fsisrt sfisrt isfsrt sifsrt fissrt ifssrt fsisrt sfisrt isfsrt sifsrt fssirt sfsirt fssirt sfsirt ssfirt ssfirt issfrt sisfrt issfrt sisfrt ssifrt ssifrt rissft irssft rsisft srisft isrsft sirsft rissft irssft rsisft srisft isrsft sirsft rssift srsift rssift srsift ssrift ssrift issrft sisrft issrft sisrft ssirft ssirft fritss rfitss firtss ifrtss riftss irftss frtiss rftiss ftriss tfriss rtfiss trfiss fitrss iftrss ftirss tfirss itfrss tifrss ritfss irtfss rtifss trifss itrfss tirfss frists rfists firsts ifrsts rifsts irfsts frsits rfsits fsrits sfrits rsfits srfits fisrts ifsrts fsirts sfirts isfrts sifrts risfts irsfts rsifts srifts isrfts sirfts frtsis rftsis ftrsis tfrsis rtfsis trfsis frstis rfstis fsrtis sfrtis rsftis srftis ftsris tfsris fstris sftris tsfris stfris rtsfis trsfis rstfis srtfis tsrfis strfis fitsrs iftsrs ftisrs tfisrs itfsrs tifsrs fistrs ifstrs fsitrs sfitrs isftrs siftrs ftsirs tfsirs fstirs sftirs tsfirs stfirs itsfrs tisfrs istfrs sitfrs tsifrs stifrs ritsfs irtsfs rtisfs trisfs itrsfs tirsfs ristfs irstfs rsitfs sritfs isrtfs sirtfs rtsifs trsifs rstifs srtifs tsrifs strifs itsrfs tisrfs istrfs sitrfs tsirfs stirfs frstsi rfstsi fsrtsi sfrtsi rsftsi srftsi frtssi rftssi ftrssi tfrssi rtfssi trfssi fstrsi sftrsi ftsrsi tfsrsi stfrsi tsfrsi rstfsi srtfsi rtsfsi trsfsi strfsi tsrfsi frssti rfssti fsrsti sfrsti rsfsti srfsti frssti rfssti fsrsti sfrsti rsfsti srfsti fssrti sfsrti fssrti sfsrti ssfrti ssfrti rssfti srsfti rssfti srsfti ssrfti ssrfti frtssi rftssi ftrssi tfrssi rtfssi trfssi frstsi rfstsi fsrtsi sfrtsi rsftsi srftsi ftsrsi tfsrsi fstrsi sftrsi tsfrsi stfrsi rtsfsi trsfsi rstfsi srtfsi tsrfsi strfsi fstsri sftsri ftssri tfssri stfsri tsfsri fsstri sfstri fsstri sfstri ssftri ssftri ftssri tfssri fstsri sftsri tsfsri stfsri stsfri tssfri sstfri sstfri tssfri stsfri rstsfi srtsfi rtssfi trssfi strsfi tsrsfi rsstfi srstfi rsstfi srstfi ssrtfi ssrtfi rtssfi trssfi rstsfi srtsfi tsrsfi strsfi stsrfi tssrfi sstrfi sstrfi tssrfi stsrfi fistsr ifstsr fsitsr sfitsr isftsr siftsr fitssr iftssr ftissr tfissr itfssr tifssr fstisr sftisr ftsisr tfsisr stfisr tsfisr istfsr sitfsr itsfsr tisfsr stifsr tsifsr fisstr ifsstr fsistr sfistr isfstr sifstr fisstr ifsstr fsistr sfistr isfstr sifstr fssitr sfsitr fssitr sfsitr ssfitr ssfitr issftr sisftr issftr sisftr ssiftr ssiftr fitssr iftssr ftissr tfissr itfssr tifssr fistsr ifstsr fsitsr sfitsr isftsr siftsr ftsisr tfsisr fstisr sftisr tsfisr stfisr itsfsr tisfsr istfsr sitfsr tsifsr stifsr fstsir sftsir ftssir tfssir stfsir tsfsir fsstir sfstir fsstir sfstir ssftir ssftir ftssir tfssir fstsir sftsir tsfsir stfsir stsfir tssfir sstfir sstfir tssfir stsfir istsfr sitsfr itssfr tissfr stisfr tsisfr isstfr sistfr isstfr sistfr ssitfr ssitfr itssfr tissfr istsfr sitsfr tsisfr stisfr stsifr tssifr sstifr sstifr tssifr stsifr ristsf irstsf rsitsf sritsf isrtsf sirtsf ritssf irtssf rtissf trissf itrssf tirssf rstisf srtisf rtsisf trsisf strisf tsrisf istrsf sitrsf itsrsf tisrsf stirsf tsirsf risstf irsstf rsistf sristf isrstf sirstf risstf irsstf rsistf sristf isrstf sirstf rssitf srsitf rssitf srsitf ssritf ssritf issrtf sisrtf issrtf sisrtf ssirtf ssirtf ritssf irtssf rtissf trissf itrssf tirssf ristsf irstsf rsitsf sritsf isrtsf sirtsf rtsisf trsisf rstisf srtisf tsrisf strisf itsrsf tisrsf istrsf sitrsf tsirsf stirsf rstsif srtsif rtssif trssif strsif tsrsif rsstif srstif rsstif srstif ssrtif ssrtif rtssif trssif rstsif srtsif tsrsif strsif stsrif tssrif sstrif sstrif tssrif stsrif istsrf sitsrf itssrf tissrf stisrf tsisrf isstrf sistrf isstrf sistrf ssitrf ssitrf itssrf tissrf istsrf sitsrf tsisrf stisrf stsirf tssirf sstirf sstirf tssirf stsirf
Note: these 'words' (valid or invalid) are all the permutations of the word frists. These words are obtained by scrambling the letters in frists.