Draw class diagram for Online Learning System. Make necessary assumptions.

In an Online Learning System, the class diagram represents the structure and relationships between different entities involved in the system. For this diagram, we can make the following assumptions:

1. There are users, including learners and instructors.
2. There are courses offered, which contain modules or lessons.
3. Users can register, log in, and access course content.
4. Instructors can create courses, upload materials, and track learners' progress.
5. Learners can enroll in courses, take quizzes, and track their progress.
6. There are assessments (quizzes or assignments) associated with courses.
7. The system stores user information, course details, and progress.

Based on these assumptions, the class diagram for an Online Learning System will include the following classes:

1. User:
   - Attributes:
     - `userID`: String
     - `name`: String
     - `email`: String
     - `password`: String
     - `role`: String (could be 'Learner' or 'Instructor')
   - Methods:
     - `register()`: Registers the user.
     - `login()`: Allows the user to log in.
     - `updateProfile()`: Updates user information.

2. Learner (inherits from User):
   - Attributes:
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