The affix īkak comes in the sense of 'this is whose weapon' after the words 1. śakti and 2. yaṣṭyi,
This debars ठक् ॥ Thus शक्तिः प्रहरणमस्य = शाक्तीकः, So also याष्टीकः ॥,
Adhyāya 4 · Pāda 4 · Rule 59
The affix īkak comes in the sense of 'this is whose weapon' after the words 1. śakti and 2. yaṣṭyi,
This debars ठक् ॥ Thus शक्तिः प्रहरणमस्य = शाक्तीकः, So also याष्टीकः ॥,