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Shinsen Zuinō (新撰髄脳) is a Japanese poetic treatise (karonsho) dealing with waka poetry and written by the nobleman and poet Fujiwara no Kintō. Its date of composition is unknown.

Authorship and date
Shinsen Zuinō was written by the nobleman and poet Fujiwara no Kintō. Although the precise year in which Kintō produced the work is not known, there are a number of theories.

Title
Shinsen translates to "newly compiled". Zuinō refers to the concept of expounding on the true nature of waka, and is a common noun used to describe poetic treatises.

https://ja.wikipedia.org/wiki/%E5%B0%8F%E7%94%BA%E8%B0%B7%E7%85%A7%E5%BD%A6