◉◉◉◉◉◉◉◉ ◉◉◉◉◉◉◉◉ The most important features of the program: search : ◉ Comprehensive research in the book. ◉ Searchable section within each subsection separately. ◉ A section to search within a specified number of sections according to what the user wants. ◉ A section for internal search for the chapters of each book. ◉ Section to search within each section independently. lines : ◉ The ability to change the font size. ◉ The ability to change the font color. ◉ The ability to change the font