rolfs orlfs rlofs lrofs olrfs lorfs rofls orfls rfols frols ofrls forls rlfos lrfos rflos frlos lfros flros olfrs lofrs oflrs folrs lfors flors rolsf orlsf rlosf lrosf olrsf lorsf roslf orslf rsolf srolf osrlf sorlf rlsof lrsof rslof srlof lsrof slrof olsrf losrf oslrf solrf lsorf slorf rofsl orfsl rfosl frosl ofrsl forsl rosfl orsfl rsofl srofl osrfl sorfl rfsol frsol rsfol srfol fsrol sfrol ofsrl fosrl osfrl sofrl fsorl sforl rlfso lrfso rflso frlso lfrso flrso rlsfo lrsfo rslfo srlfo lsrfo slrfo rfslo frslo rsflo srflo fsrlo sfrlo lfsro flsro lsfro slfro fslro sflro olfsr lofsr oflsr folsr lfosr flosr olsfr losfr oslfr solfr lsofr slofr ofslr foslr osflr soflr fsolr sfolr lfsor flsor lsfor slfor fslor sflor
Note: these 'words' (valid or invalid) are all the permutations of the word rolfs. These words are obtained by scrambling the letters in rolfs.