Dark retreat styles

Dark retreat styles: 1. Tantric dark retreat style 2. Trekchö dark retreat style 3. Longde dark retreat style 4. Upadesha dark retreat style 4.1 Usual Upadesha dark retreat style 4.2 Semdzin dark retreat style (yangti) 4.3 Tsalung dark retreat style 4.4 Shitro dark retreat style 4.5 Special secret dark retreat style