The roots having an indicatory m retain their penultimate short vowel before the causative ṇi,
The मित् roots are घटादि a subdivision of Bhwadi (800 to 873), and all other roots that end in अम् as शम् and तम् of Divadi class. Thus घटयति, व्यथयति, जनयति, रजयति, शमयति, ज्ञपयति ॥ Some read the anuvritti of the word 'optionally' from the last sutra into this. This will then be a limited option only (vyavasthita-vibhasha). The forms उत्क्रामयति and संक्रामयति are thus explained.,