2.3.31 एनपा द्वितीया

एनप् -suffixed words bear द्वितीया (unlike षष्ठी for अतसर्थ in 2.3.30). Hence, दक्षिणेन ग्रामम् and  ग्रामस्य उत्तरेण are both permissible (the former having  अतसर्थ).