śaśaśiraso 'vayavā nimnā vṛddhikāṭhinyābhyāṃ rahitā viṣāṇādirūpeṇātyantamasanto 'nyantābhāva ucyate
When the flat parts of a hare's head are devoid of growth and hardness, [and] entirely non-existent in the form of horns, this is called 'absolute negation'