e is optionally substituted for a of the aṅga (stems) 1. jar (jṝ) 2. bhrama and 3. tras and the reduplicate is thereby elided before the affixes of the liṭ (Perfect Tense) having an indicatory k (or ṅ),
Thus जेरतुः, जेरुः, जेरिथ, or जजरतुः, अजरुः, जजरिथ, भ्रेमतुः, भ्रेमुः, भ्रेमिथ, or बभ्रमतुः, बभ्रमुः, बभ्रमिथ, त्रेसतुः, त्रेसुः, त्रेसिथ, or तत्रसतुः, तत्रसुः, तत्रसिथ ॥,