frigs rfigs firgs ifrgs rifgs irfgs frgis rfgis fgris gfris rgfis grfis figrs ifgrs fgirs gfirs igfrs gifrs rigfs irgfs rgifs grifs igrfs girfs frisg rfisg firsg ifrsg rifsg irfsg frsig rfsig fsrig sfrig rsfig srfig fisrg ifsrg fsirg sfirg isfrg sifrg risfg irsfg rsifg srifg isrfg sirfg frgsi rfgsi fgrsi gfrsi rgfsi grfsi frsgi rfsgi fsrgi sfrgi rsfgi srfgi fgsri gfsri fsgri sfgri gsfri sgfri rgsfi grsfi rsgfi srgfi gsrfi sgrfi figsr ifgsr fgisr gfisr igfsr gifsr fisgr ifsgr fsigr sfigr isfgr sifgr fgsir gfsir fsgir sfgir gsfir sgfir igsfr gisfr isgfr sigfr gsifr sgifr rigsf irgsf rgisf grisf igrsf girsf risgf irsgf rsigf srigf isrgf sirgf rgsif grsif rsgif srgif gsrif sgrif igsrf gisrf isgrf sigrf gsirf sgirf
Note: these 'words' (valid or invalid) are all the permutations of the word frigs. These words are obtained by scrambling the letters in frigs.