After the verbs having the penultimate short ṛ , the affix kyap is used, with the exception of the verbs kḷp 'to be able' and vṛt 'to hurt'.,
Thus वृत् + क्यप् = वृत्यम्; so also वृध्यम्. But क्लृप् and चृत् will form कल्प्यम्, and चर्त्यम्.
Why have we used the letter त् in ऋत् ? It is to indicate that short ऋ
is meant and not long ॠ (I. I. 70). Therefore the root कॄत् will take ण्यत् and form कीर्त्यम्.
Vart:- The root सृज् takes the affix ण्यत् when compounded with the word पाणि. Thus पाणिसर्ग्या रज्जुः 'a rope'.
Vart:- The root सृज् when preceded by both सम् and अव takes ण्यत् as समवसर्ग्या.,