rtool trool rotol ortol torol otrol rtool trool rotol ortol torol otrol rootl orotl rootl orotl oortl oortl toorl otorl toorl otorl ootrl ootrl rtolo trolo rotlo ortlo torlo otrlo rtloo trloo rltoo lrtoo tlroo ltroo rolto orlto rloto lroto olrto lorto tolro otlro tloro ltoro oltro lotro rtolo trolo rotlo ortlo torlo otrlo rtloo trloo rltoo lrtoo tlroo ltroo rolto orlto rloto lroto olrto lorto tolro otlro tloro ltoro oltro lotro roolt orolt roolt orolt oorlt oorlt rolot orlot rloot lroot olrot lorot rolot orlot rloot lroot olrot lorot oolrt oolrt olort loort olort loort toolr otolr toolr otolr ootlr ootlr tolor otlor tloor ltoor oltor lotor tolor otlor tloor ltoor oltor lotor ooltr ooltr olotr lootr olotr lootr
Note: these 'words' (valid or invalid) are all the permutations of the word rtool. These words are obtained by scrambling the letters in rtool.