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def matrix_mult(A: List[List[float]], B: List[List[float]]) -> List[List[float]]: """Multiply two matrices (A rows, B cols compatible).""" if not A or not B or len(A[0]) != len(B): raise ValueError("Incompatible dimensions") result = [[0] * len(B[0]) for _ in range(len(A))] for i in range(len(A)): for j in range(len(B[0])): total = 0 for k in range(len(B)): total += A[i][k] * B[k][j] result[i][j] = total return result

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