the five basic Mahayoga Tantras which are concerned with the five aspects of Buddhahood. 1) {sku'i rgyud dpal sangs rgyas thams cad mnyam par sbyor} the tantra dealing with existence. 2) {gsung rgyud zla gsang thig le} the tantra dealing with communication. 3) {thugs kyi rgyud gsang ba 'dus pa} the tantra dealing with noeticness or spirituality. 4) {yon tan gyi rgyud dpal mchog dang po} the tantra dealing with excellent capabilities. 5) {'phrin las kyi rgyud kar ma le} the tantra dealing with activity or performance