Usually when copying or printing something, only one side is printed. Graduation thesis is usually printed on both sides, that is, it is printed on both sides like ordinary books.

There are two sides, four-color printing is four-color printing, and three-color printing is only three-color printing. The difference depends on whether you overprint or overprint. In case of overprinting, four-color printing is a printing form using four colors of cyan, magenta, yellow and black, and overprinting is a printing operation using four-color ink.