The affix ṣpha is added in the feminine after the words 1. kauravya and 2. māṇḍūka,
The word कौरव्य is formed by adding the affix ण्य to the base कुरु 4.1.151; this word, ending in अ, would have formed its feminine by टाप् 4.1.4, but for the present sutra. So also by 4.1.119, the word माण्डूक is formed by अण् added to मण्डूक; and the feminine of manduka would have been formed by nip 4.1.15, but for the present aphorism, which supersedes that affix. Thus कौरव्यायणी, माण्डूकायनी ॥
How do you explain the form कौरवी in the phrase कौरवी सेना ?
We explain it by saying that कौरवी is not the feminine of कौरव्य; but of कौरव, formed by adding अण् to कुरु by sutra 4.3.120.
Vart:- The word आसुरि should be enumerated along with kauravya and mandukya. Thus आसुरायणी ॥ The word आसुरि is formed by the affix इञ् added to the word असुर; the word 'asuri' would, therefore have taken the affix अण् in forming the further derivative 4.2.112. But according to the opinion of Patanjali, the word, 'asuri' should form its further derivative (called also शैषिक) by taking the affix छ 4.2.114. Thus आसुरीयः कल्पः (तेन प्रोक्तम्) ॥,