the four authentic pervasions. 1) {rjes khyab rnal ma}. 2) {ldog khyab rnal ma} 3) {thur khyab rnal ma} 4) {'gal khyab rnal ma} Part of {rtags gsal khyab pa sgo brgyad} Four positive pervasions. 1) {rjes khyab} subsequent pervasion [see. {rjes khyab}. 2) {ldog khyab} counter pervasion. 3) {'gal khyab} contrary pervasion. 4) {thur khyab} downward pervasion