Chinese Reference Series for Foreigners As the first concise dictionary of separable words based on the "Outline of the Graded Vocabulary for HSK", the dictionary includes altogether 268 separable words from the Outline, consisting of 18 Level A words, 47 Level В words, 47 Level С words and 156 Level D words. The dictionary is written for learners who learn Chinese as their second language, especially for the learners with intermediate or advanced Chinese proficiency. It can also serve as a reference for CFL teachers in teaching separable words.