Uttaratantra - source of karma and afflictions 4
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ma is a negation, see here for more information about negations in the Tibetan grammar.
All together, ma yin means is not. What is negated, the word we talked about earlier, yid byed, or the word before the negation, tshul bzhin? Well, best to translate it all and then it will be revealed. Meanwhile, put ma yin into your mental storage container, in the closest shelf, as you will encounter this pattern a lot.