The affix ghañ comes after the roots 1. kṣu 'to sneeze' 2. śru 'to move and hear' when the preposition vi is in composition.,
This debars the affix अप् 3.3.57; as, विक्षावः 'cough'; विश्रावः 'flowing forth', 'celebrated'. But when without preposition, we have क्षवः and श्रवः ।,