ཀུན་ཀྱང་གནས་གསུམ་ཡིག་འབྲུ་གསུམ་གྱིས་མཚན༔
Their three centres are marked with the three seed syllables
Longchen Nyingtik, Dukngal Rangdrol, Avalokiteśvara, Sādhanas, Tibetan Masters, Dilgo Khyentse Rinpoche