As described in father anuttarayoga tantra, four levels of subtle mind that are progressively more devoid of coarser levels of mind, and corresponding to the white appearance, red increase and black near-attainment subtle conceptual minds and the clear light mind: (1) void, (2) very void, (3) greatly void and (4) all-void.
Tibetan: སྟོང་པ་བཞི། stong-pa bzhi
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