… but there is a condition. All pages must contain text or images. If you wish to include a blank page for some reason, please print “Page intentionally left blank” centered in the middle of the page to clearly indicate your intent. Use title case, 14 pt.
Such justification causes a number of problems such as adding unnecessary spaces between words to stretch a line out to meet the right margin. Such gaps look rather awkward and unprofessional. Book and journal publishers have more sophisticated layout software that can justify both margins, yet avoid awkward space gaps. Therefore, use flush (justified) left, ragged right.