atra ca yuktiṃ varṇayanti yad upalabdhilakṣaṇaprāptaṃ sad anupalabhyamānasattākam, tat prekṣāvatām asadvyavahāraviṣayaḥ, yathā śaśaviṣāṇam.
Here they present the argument that whatever exists but is not perceived despite being perceptible should be treated as non-existent by rational people, like a hare's horn.