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serref rseref sreref rersef errsef rresef rresef errsef rersef resref ersref rseref sreref esrref serref rrseef rrseef rsreef srreef rsreef srreef ersref resref esrref serref rseref sreref eersrf eersrf eresrf reesrf eresrf reesrf eesrrf eesrrf eserrf seerrf eserrf seerrf erserf reserf esrerf sererf rseerf sreerf erserf reserf esrerf sererf rseerf sreerf rferse frerse refrse erfrse ferrse efrrse rfrese frrese rrfese rrfese frrese rfrese rerfse errfse rrefse rrefse errfse rerfse ferrse efrrse frerse rferse erfrse refrse rfesre fresre refsre erfsre fersre efrsre rfsere frsere rsfere srfere fsrere sfrere resfre ersfre rsefre srefre esrfre serfre fesrre efsrre fserre sferre esfrre sefrre rfrsee frrsee rrfsee rrfsee frrsee rfrsee rfsree frsree rsfree srfree fsrree sfrree rrsfee rrsfee rsrfee srrfee rsrfee srrfee frsree rfsree fsrree sfrree rsfree srfree rersfe errsfe rresfe rresfe errsfe rersfe resrfe ersrfe rserfe srerfe esrrfe serrfe rrsefe rrsefe rsrefe srrefe rsrefe srrefe ersrfe resrfe esrrfe serrfe rserfe srerfe fersre efrsre fresre rfesre erfsre refsre fesrre efsrre fserre sferre esfrre sefrre frsere rfsere fsrere sfrere rsfere srfere ersfre resfre esrfre serfre rsefre srefre efersr feersr eefrsr eefrsr feersr efersr efresr feresr erfesr refesr freesr rfeesr eerfsr eerfsr erefsr reefsr erefsr reefsr feresr efresr freesr rfeesr erfesr refesr efesrr feesrr eefsrr eefsrr feesrr efesrr efserr feserr esferr seferr fseerr sfeerr eesfrr eesfrr esefrr seefrr esefrr seefrr feserr efserr fseerr sfeerr esferr seferr efrser ferser erfser refser freser rfeser efsrer fesrer esfrer sefrer fserer sferer ersfer resfer esrfer serfer rsefer srefer frseer rfseer fsreer sfreer rsfeer srfeer eersfr eersfr eresfr reesfr eresfr reesfr eesrfr eesrfr eserfr seerfr eserfr seerfr ersefr resefr esrefr serefr rseefr sreefr ersefr resefr esrefr serefr rseefr sreefr ferser efrser freser rfeser erfser refser fesrer efsrer fserer sferer esfrer sefrer frseer rfseer fsreer sfreer rsfeer srfeer ersfer resfer esrfer serfer rsefer srefer
Note: these 'words' (valid or invalid) are all the permutations of the word refers. These words are obtained by scrambling the letters in refers.