In a question bank it is possible to define relations between exercises. These relations are shown in a question bank assignment if you put questions with relation to each other in the same question bank assignment.
There are two types of relations, enemy and relative, which will be explained below.
Enemy exercises are when an exercise could include information that gives away the answer to another exercise within the test. The way an exercise is worded may have information that is required in the answer of another exercise.
Relative exercises are exercises that are similar, only varying on small details. Most often, you wouldn't want to include similar exercises within the same assignment.