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Difficulty Grading Explanation
Language - Grammar structure and sentence style. Length of sentences and paragraphs. The writing prose (e.g. modern, historical, poetic, flowery).
Vocabulary - The range of unique, uncommon and complex vocabulary. Frequency of Chinese idioms (成语 - chengyu) used.
Content Complexity - Storytelling, lore, character and world-building complexity.
Subject Knowledge - Amount of knowledge required in a particular subject matter
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