Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....that will the the lines in the block $lines_of_first_block = ...fist line from the collection of lines $first_line = $lines_of_first_block[0];...