The Class Relationships Table

In the bottom right-hand area of the screen is a little table where you specify constraints about how the algorithm can arrange classes into lines.

Courses can have more than one class, and so we specify classes using the syntax <coursecode>.<n> e.g. '11BIO.2' . This table takes 2 classes and indicates if they should be vertically linked or horizontally linked.

If you type in a code and it's not accepted then it's because you misspelled it, or you entered a course that has zero classes. But you don't need to worry about uppercase/lowercase.