A question of Nala
In Nala Ch. 5, sentence 4, reads the sentence:
सुष्णन्ती प्रभया राज्ञां चक्षूंषि च मनांसि च
according to the rules, the present part. of irregular verbs, when forming the female form, should not add a "n", but why here the word "sushnanti" with a "n" between "a" and "t"?