chook hcook cohok ochok hocok ohcok chook hcook cohok ochok hocok ohcok coohk ocohk coohk ocohk oochk oochk hoock ohock hoock ohock oohck oohck choko hcoko cohko ochko hocko ohcko chkoo hckoo ckhoo kchoo hkcoo khcoo cokho ockho ckoho kcoho okcho kocho hokco ohkco hkoco khoco okhco kohco choko hcoko cohko ochko hocko ohcko chkoo hckoo ckhoo kchoo hkcoo khcoo cokho ockho ckoho kcoho okcho kocho hokco ohkco hkoco khoco okhco kohco cookh ocokh cookh ocokh oockh oockh cokoh ockoh ckooh kcooh okcoh kocoh cokoh ockoh ckooh kcooh okcoh kocoh ookch ookch okoch kooch okoch kooch hookc ohokc hookc ohokc oohkc oohkc hokoc ohkoc hkooc khooc okhoc kohoc hokoc ohkoc hkooc khooc okhoc kohoc ookhc ookhc okohc koohc okohc koohc
Note: these 'words' (valid or invalid) are all the permutations of the word chook. These words are obtained by scrambling the letters in chook.