كتاب الصرف الكافي

The Book of Al-Safr al-Kafi al-Sufr is a science that searches for the structures of the Arabic word, its formula, and the statement of its letters, such as originality, addition, deletion, validity, declension, replacement, etc.
This book is sufficient morphology, and morphological rules are not just information that is understood and preserved; But it is a means to an end, and it is a means to uprighting the tongue on certain methods, and special patterns of pronunciation.