The affix ḍhak comes in the sense of 'nature or action thereof' after the words 1. kapi and 2. jñāti,
Thus कपेर्भावः कर्म वा = कपियम्, ज्ञातेयम् ॥ The rule of यथासंख्य 1.3.10 does not apply any where under this head.,
कपि-ज्ञात्योर् ढक्
Adhyāya 5 · Pāda 1 · Rule 127