>>> next_word_list('red', ['red','yellow','red','black','grey','red']) ['yellow', 'black'] >>> next_word_list('big', ['small','big']) [] >>> next_word_list('big' , ['big','small']) ['small'] >>> next_word_list('blue', ['green']) [] >>> next_word_list('blue', []) [] >>> next_word_list('red', ['red','red','red']) ['red', 'red']