[{"Name":"Sturm-Liouville Problems","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction","Duration":"28m 28s","ChapterTopicVideoID":28210,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29443},{"Watched":false,"Name":"Exercise 1","Duration":"10m 30s","ChapterTopicVideoID":28211,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29444},{"Watched":false,"Name":"Exercise 2","Duration":"12m 45s","ChapterTopicVideoID":28212,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29445},{"Watched":false,"Name":"Exercise 3","Duration":"14m 28s","ChapterTopicVideoID":28213,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29446},{"Watched":false,"Name":"Exercise 4","Duration":"7m 24s","ChapterTopicVideoID":28214,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29447},{"Watched":false,"Name":"Exercise 5","Duration":"6m 32s","ChapterTopicVideoID":28215,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29448},{"Watched":false,"Name":"Exercise 6","Duration":"10m 8s","ChapterTopicVideoID":28207,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29449},{"Watched":false,"Name":"Exercise 7","Duration":"6m 7s","ChapterTopicVideoID":28208,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29450},{"Watched":false,"Name":"Exercise 8","Duration":"7m 16s","ChapterTopicVideoID":28209,"CourseChapterTopicPlaylistID":277669,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29451}],"ID":277669},{"Name":"The Heat Equation","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Exercise 1","Duration":"8m 11s","ChapterTopicVideoID":28190,"CourseChapterTopicPlaylistID":277670,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29422},{"Watched":false,"Name":"Exercise 2","Duration":"5m 33s","ChapterTopicVideoID":28186,"CourseChapterTopicPlaylistID":277670,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29423},{"Watched":false,"Name":"Exercise 3","Duration":"6m 49s","ChapterTopicVideoID":28187,"CourseChapterTopicPlaylistID":277670,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29424},{"Watched":false,"Name":"Exercise 4","Duration":"6m 10s","ChapterTopicVideoID":28188,"CourseChapterTopicPlaylistID":277670,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29425},{"Watched":false,"Name":"Exercise 5","Duration":"5m 38s","ChapterTopicVideoID":28189,"CourseChapterTopicPlaylistID":277670,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29426}],"ID":277670},{"Name":"The Wave Equation","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Exercise 1","Duration":"7m 1s","ChapterTopicVideoID":28184,"CourseChapterTopicPlaylistID":277671,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29419},{"Watched":false,"Name":"Exercise 2","Duration":"9m 31s","ChapterTopicVideoID":28185,"CourseChapterTopicPlaylistID":277671,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29420},{"Watched":false,"Name":"Exercise 3","Duration":"9m 10s","ChapterTopicVideoID":28183,"CourseChapterTopicPlaylistID":277671,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":29421}],"ID":277671}]

[{"ID":277669,"Videos":[29443,29444,29445,29446,29447,29448,29449,29450,29451]},{"ID":277670,"Videos":[29422,29423,29424,29425,29426]},{"ID":277671,"Videos":[29419,29420,29421]}];

[29443,29444,29445,29446,29447,29448,29449,29450,29451];

1.1

1