thank htank tahnk athnk hatnk ahtnk thnak htnak tnhak nthak hntak nhtak tanhk atnhk tnahk ntahk anthk nathk hantk ahntk hnatk nhatk anhtk nahtk thakn htakn tahkn athkn hatkn ahtkn thkan htkan tkhan kthan hktan khtan takhn atkhn tkahn ktahn akthn kathn haktn ahktn hkatn khatn akhtn kahtn thnka htnka tnhka nthka hntka nhtka thkna htkna tkhna kthna hktna khtna tnkha ntkha tknha ktnha nktha kntha hnkta nhkta hknta khnta nkhta knhta tankh atnkh tnakh ntakh antkh natkh taknh atknh tkanh ktanh aktnh katnh tnkah ntkah tknah ktnah nktah kntah ankth nakth aknth kanth nkath knath hankt ahnkt hnakt nhakt anhkt nahkt haknt ahknt hkant khant akhnt kahnt hnkat nhkat hknat khnat nkhat knhat ankht nakht aknht kanht nkaht knaht
Note: these 'words' (valid or invalid) are all the permutations of the word thank. These words are obtained by scrambling the letters in thank.