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https://buddha-nature.com/2018/09/01/the-heart-essence-of-the-prajna-paramita-in-one-syllable-sutra-a-treasure-teaching-gterma-of-guru-chowang-chokyi-wangchuk/
The Heart-Essence of the Prajñā-pāramitā in One Syllable Sūtra, A Treasure Teaching (gTerma) of Guru Chöwang, Chökyi Wangchuk