O-rgyan-'gro-'dul-kun-'dus-glin-pa, Rwa-khro Gter-stonPhyag rdor thugs kyi snin khu'i skor: A cycle of practice focussing upon the Sadhana of Vajrapani. Revealed from its place of concealment by Rwa-khro Gter-ston O-rgyan-'gro-'dul-kun-'dus-glin-pa