e is not substituted for a of śas , dad or of roots beginning with a v or of such verbal aṅga (stems) in which the a results through the substitution being kit or ṅit follow, of the seṭ thal of the liṭ (Perfect Tense) nor is the reduplicate elided.,
Thus विशशसतुः, विशशसुः, विशशसिथे, दददे, दददाते, दददिर, Of roots beginning with व् :-ववमतुः, ववमुः, ववमिथ, ॥ Of roots where अ is the result of Guna, विशशरतुः, विशशरुः, विशशरिथ, लुलविथ, पुपविथ ॥ गुणशब्दाभिनिर्वृत्तस्यार्शब्दस्यौकारस्य चायमकार इति एत्वं प्रतिषिध्यते ॥
The अ of Guna may result either from the guna of ऋ as कृ changed to कर् or of उ changed to ओ again changed to अव् as लु-लव ॥,