The affix eṇya comes in the remaining senses after the word prāvṛṣa,
This debars the अण् of the last sutra, though 'pravrish' is a season-denoting word. Thus प्रावृषेण्यो बलाहकः \the belonging to the rainy season.\,
प्रावृष एण्यः
Adhyāya 4 · Pāda 3 · Rule 17