The niṣṭhā ta is not changed to na after 1. dhyā 2. khyā 3. pṝ 4. mūrchi and 5. mada,
Thus ध्यातः, ध्यातवान्, ख्यातः, ख्यातवान्, पूर्त्तः, पूर्त्तवान्, मूर्त्तः, मूर्त्तवान्, मत्तः, मत्तवान् ॥
This debars the न change prescribed by 8.2.42, 8.2.43.
The root मूर्च्छि is exhibited in the sutra_ in its lengthened form; the root मूर्च्छ is lengthened by 8.2.78, and the च्छ is elided before त by 6.4.21.,