rouls oruls ruols urols ourls uorls rolus orlus rlous lrous olrus lorus rulos urlos rluos lruos ulros luros oulrs uolrs olurs lours ulors luors rousl orusl ruosl urosl oursl uorsl rosul orsul rsoul sroul osrul sorul rusol ursol rsuol sruol usrol surol ousrl uosrl osurl sourl usorl suorl rolsu orlsu rlosu lrosu olrsu lorsu roslu orslu rsolu srolu osrlu sorlu rlsou lrsou rslou srlou lsrou slrou olsru losru oslru solru lsoru sloru rulso urlso rluso lruso ulrso lurso ruslo urslo rsulo srulo usrlo surlo rlsuo lrsuo rsluo srluo lsruo slruo ulsro lusro uslro sulro lsuro sluro oulsr uolsr olusr lousr ulosr luosr ouslr uoslr osulr soulr usolr suolr olsur losur oslur solur lsour slour ulsor lusor uslor sulor lsuor sluor
Note: these 'words' (valid or invalid) are all the permutations of the word rouls. These words are obtained by scrambling the letters in rouls.