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Answer: Lüshi — Lüshi ('regulated verse') required the poet to balance level and oblique tones across couplets that mirrored each other in grammar and imagery—a formal constraint that Li Bai famously resisted and Du Fu mastered.
Lüshi ('regulated verse') required the poet to balance level and oblique tones across couplets that mirrored each other in grammar and imagery—a formal constraint that Li Bai famously resisted and Du Fu mastered.