མ་ནིང་བཞི་ཡི་ས་བོན་དང་། །
{7.3.31} “The heart mantras for the surrounding gate keepers Are the four neuter vowel syllables (ṛ, ṝ, ḷ, ḹ); The remaining vowels constitute the mantras for the eight offering goddesses.
Light, Reality, Assembly