CC Ādi 14.94
alpa dine dvādaśa-phalā akṣara śikhila
The twelve phalā, or combinations of letters, are called repha; mūrdhanya (cerebral), ṇa; dāntavya (dental), na; ma; ya; ra; la; va; ṛ; ṝ; ḷ; and ḷ. Hāte khaḍi is the primary educational beginning. At the age of four or five years, on an auspicious day called vidyārambha marking the beginning of primary education, there is a ceremony worshiping Lord Viṣṇu, and after that the teacher gives the child a long chalk pencil. Then, guiding the hand of the student, he instructs him how to write the letters of the alphabet (a, ā, i, etc.) by writing big letters on the floor. When the child is a little advanced in writing, he is given a slate for his primary education, which ends when he learns the two-letter combinations, which are called phalā, as mentioned above.