What came to do and did one meaning

The book of what came to do and did in one sense consisting of the letters of the lexicon in the circle of the interest of specialists in the scope of Arabic language sciences in particular and those researchers in topics closely related in general; Where the book of what came to do and did in one sense consisting of the letters of the lexicon within the scope of language science and the documentation of other specializations such as poetry, grammar, literature, rhetoric, and Arabic literature.