$3\mathrm{.}16(5)$ Figure E$3\mathrm{.}8$ is a portion of a class diagram for a computer system for laying out a newspaper. The system handles newspaper pages which may contain, among other things, columns of text. The user may edit the width and length of a column of text, move it around on a page, or move it from one page to another. As shown, a column is displayed on exactly one page.

Figure E$3\mathrm{.}8$ Portion of a class diagram for a newspaper publishing system