frisk rfisk firsk ifrsk rifsk irfsk frsik rfsik fsrik sfrik rsfik srfik fisrk ifsrk fsirk sfirk isfrk sifrk risfk irsfk rsifk srifk isrfk sirfk friks rfiks firks ifrks rifks irfks frkis rfkis fkris kfris rkfis krfis fikrs ifkrs fkirs kfirs ikfrs kifrs rikfs irkfs rkifs krifs ikrfs kirfs frski rfski fsrki sfrki rsfki srfki frksi rfksi fkrsi kfrsi rkfsi krfsi fskri sfkri fksri kfsri skfri ksfri rskfi srkfi rksfi krsfi skrfi ksrfi fiskr ifskr fsikr sfikr isfkr sifkr fiksr ifksr fkisr kfisr ikfsr kifsr fskir sfkir fksir kfsir skfir ksfir iskfr sikfr iksfr kisfr skifr ksifr riskf irskf rsikf srikf isrkf sirkf riksf irksf rkisf krisf ikrsf kirsf rskif srkif rksif krsif skrif ksrif iskrf sikrf iksrf kisrf skirf ksirf
Note: these 'words' (valid or invalid) are all the permutations of the word frisk. These words are obtained by scrambling the letters in frisk.