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class Student {} class CourseSection {} class Registration { * -- 1 Student; * -- 1 CourseSection; }//$?[End_of_model]$? class Student { position 50 30 109 45; } class CourseSection { position 97 203 109 45; } class Registration { position 67 123 109 45; position.association CourseSection__Registration 84,45 29,0; }