.
├── 1000-Level-Courses
│   ├── ComputerScience1
│   └── ComputerScience2
├── 2000-Level-Courses
│   ├── Algorithms-&-Data-Structures
│   └── Event-Driven-&-GUIs
├── 3000-Level-Courses
│   └── OS-&-Concurrency
├── MIT-OpenCourseWare
│   └── Artificial-Intelligence
└── Utilities
    └── Timer