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    | Lecture 19: Fiedler's Thm and Generalized Laplacian's 
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    | Lecture 20: Eigenvalues and Vectors by Iterative Methods 
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    | Lecture 23: Solving Graph Laplacians in Nearly O(m log n) time 
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    | Lecture 24: Solving Graph Laplacians in Nearly O(m log n) time 
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    | Lecture 25: Random Walks with Restarts and Spilling Paint 
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    | Lecture 26: Solving Symmetric Diagonally Dominate 
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    | Lecture 27: Counting Random Trees 
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    | Lecture 28: The Markov Chain Tree Theorem 
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    | Lecture 29: Generating Random Trees 
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    | Lecture 30: Random Walks and Matching 
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    | Lecture 31: Graph Neural Networks 
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    | Lecture 32: Backpropagation 
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    | Lecture 33: Graph neural network model 
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    | Lecture 34: Maximum Flow via Electrical Flow 
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