sems rmad du byung ba bco brgyad kyi le'u lnga bcu

Eighteen Marvels of Mind in Fifty Chapters. Several tantras in the first three volumes of the Nyingma Gyubum bear a resembling name although none of them have 50 chapters. A writing mistake seems to have appeared since The Bright Crystal Mirror by Yeshe Tsogyal says instead: "Five first parts of the Eighteen Marvels of Mind" (sems smad bco brgyad kyi stod kyi lnga), referring to the first five tantras translated by Vairotsana. [RY]