four great language groups: {legs sbyar, rang bzhin, zur chag, sha za}; Sanskrit, Prakriti, Abhramsha, Pishachi
the four major languages. 1) Sanskrit {legs sbyar skad}. 2) Prakriti {rang bzhin gyi skad}. 3) Pishachi {sha za'i skad}. 4) Avabhramsha {zur chag gi skad}