NARS v4 requirement specifications https://docs.google.com/document/d/19CTBbXGuJURXh8PjXKW0_3rUb3S329KSEAACZpNqRkM/edit?usp=sharing NARS v4 target specifications https://docs.google.com/document/d/1lmrVKOLYDRFFT4ln4x7zMeAVJHesgz94LzA2pTkmqr4/edit?usp=sharing