e is substituted for a of a verbal aṅga (stem) standing between two simple consonants, the aṅga (stem) not having any different letter substituted in the reduplicate when the ending thal of the liṭ (Perfect Tense) having the augment iṭ follows and thereby the reduplicate is elided.,
Thus पेचिथ, शेकिथ ॥ But पपक्थ before anit थ; दिदेविथ, the vowel being इ and not अ; ततक्षिथ, ररक्षिथ, the अ not standing between two simple consonants; and चकणिथ, बभणिथ, the reduplicate having the substitutes च and ब different from क and भ ॥ This sutra applies even when the affix is not कित्; and थल् is read in the sutra only for the sake of clearness, no non-kit Perfect ending can take इट् except थल् ॥,