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The book includes a CORRECT translation of the Sutras. Unfortunately, it doesn't go deep into the EXPLANATION of the Sutras. The translations is indeed a must have, but I have the feeling a further explanation was possible yet not given.
This is the Yoga Sutras of Patanjali translation and narrative that was preferred by my yoga instructor when I attended yoga teacher training. There are many translations on Amazon, so make sure you get the right one.