[{"Name":"The Complex Exponential Function","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction","Duration":"7m 16s","ChapterTopicVideoID":13798,"CourseChapterTopicPlaylistID":79628,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14583},{"Watched":false,"Name":"Exercise","Duration":"4m 45s","ChapterTopicVideoID":13799,"CourseChapterTopicPlaylistID":79628,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14584}],"ID":79628},{"Name":"The Complex Sine Function","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction","Duration":"2m 49s","ChapterTopicVideoID":13800,"CourseChapterTopicPlaylistID":79629,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14585},{"Watched":false,"Name":"An Identity","Duration":"3m 22s","ChapterTopicVideoID":13801,"CourseChapterTopicPlaylistID":79629,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14586},{"Watched":false,"Name":"Exercise","Duration":"9m 20s","ChapterTopicVideoID":13802,"CourseChapterTopicPlaylistID":79629,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14587}],"ID":79629},{"Name":"The Complex Cosine Function","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction","Duration":"2m 38s","ChapterTopicVideoID":13803,"CourseChapterTopicPlaylistID":79630,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14588},{"Watched":false,"Name":"An Identity","Duration":"3m 51s","ChapterTopicVideoID":13804,"CourseChapterTopicPlaylistID":79630,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14589},{"Watched":false,"Name":"Exercise","Duration":"8m 33s","ChapterTopicVideoID":13805,"CourseChapterTopicPlaylistID":79630,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14590}],"ID":79630},{"Name":"Elementary Transformations","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction","Duration":"8m 43s","ChapterTopicVideoID":13806,"CourseChapterTopicPlaylistID":79631,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":21324},{"Watched":false,"Name":"Exercise 1","Duration":"2m 51s","ChapterTopicVideoID":13807,"CourseChapterTopicPlaylistID":79631,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":21325},{"Watched":false,"Name":"Exercise 2","Duration":"2m 33s","ChapterTopicVideoID":13808,"CourseChapterTopicPlaylistID":79631,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":21326},{"Watched":false,"Name":"Exercise 3","Duration":"4m 15s","ChapterTopicVideoID":13809,"CourseChapterTopicPlaylistID":79631,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":21327}],"ID":79631},{"Name":"Complex Logarithms, Multivalued Functions, Roots","TopicPlaylistFirstVideoID":0,"Duration":null,"Videos":[{"Watched":false,"Name":"Introduction to Complex Logarithm","Duration":"12m 11s","ChapterTopicVideoID":13824,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14595},{"Watched":false,"Name":"Introduction to Complex Roots and Powers","Duration":"6m 12s","ChapterTopicVideoID":13825,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14596},{"Watched":false,"Name":"Exercise 1","Duration":"7m 30s","ChapterTopicVideoID":13814,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14597},{"Watched":false,"Name":"Exercise 2","Duration":"3m 10s","ChapterTopicVideoID":13815,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14598},{"Watched":false,"Name":"Exercise 3","Duration":"2m 44s","ChapterTopicVideoID":13816,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14599},{"Watched":false,"Name":"Exercise 4","Duration":"3m 20s","ChapterTopicVideoID":13817,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14600},{"Watched":false,"Name":"Introduction to Principal Values","Duration":"6m 26s","ChapterTopicVideoID":13826,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14601},{"Watched":false,"Name":"Principle Branch of the Log as a Mapping","Duration":"6m 35s","ChapterTopicVideoID":13810,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14602},{"Watched":false,"Name":"Branches of Logarithm and Square Root - Part 1","Duration":"12m ","ChapterTopicVideoID":13811,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14603},{"Watched":false,"Name":"Branches of Logarithm and Square Root - Part 2","Duration":"8m 9s","ChapterTopicVideoID":13812,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14604},{"Watched":false,"Name":"Branches of Logarithm and Square Root- Part 3","Duration":"15m 6s","ChapterTopicVideoID":13813,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14605},{"Watched":false,"Name":"Exercise 5","Duration":"8m 25s","ChapterTopicVideoID":13818,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14606},{"Watched":false,"Name":"Exercise 6","Duration":"17m 30s","ChapterTopicVideoID":13819,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14607},{"Watched":false,"Name":"Exercise 7","Duration":"3m 24s","ChapterTopicVideoID":13820,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14608},{"Watched":false,"Name":"Exercise 8","Duration":"6m 55s","ChapterTopicVideoID":13821,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14609},{"Watched":false,"Name":"Exercise 9","Duration":"5m 42s","ChapterTopicVideoID":13822,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14610},{"Watched":false,"Name":"Exercise 10","Duration":"7m 27s","ChapterTopicVideoID":13823,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14611},{"Watched":false,"Name":"Exercise 11","Duration":"10m 58s","ChapterTopicVideoID":13828,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14613},{"Watched":false,"Name":"Exercise 12","Duration":"8m 13s","ChapterTopicVideoID":13829,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14614},{"Watched":false,"Name":"Exercise 13","Duration":"7m 52s","ChapterTopicVideoID":13830,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14615},{"Watched":false,"Name":"Nonexistence of Analytic Square Root","Duration":"3m 32s","ChapterTopicVideoID":13827,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14612},{"Watched":false,"Name":"Exercise 14","Duration":"2m 52s","ChapterTopicVideoID":13831,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14616},{"Watched":false,"Name":"Exercise 15","Duration":"11m 59s","ChapterTopicVideoID":13832,"CourseChapterTopicPlaylistID":79632,"HasSubtitles":false,"VideoComments":[],"Subtitles":[],"Thumbnail":null,"ID":14617}],"ID":79632}]

[{"ID":79628,"Videos":[14583,14584]},{"ID":79629,"Videos":[14585,14586,14587]},{"ID":79630,"Videos":[14588,14589,14590]},{"ID":79631,"Videos":[21324,21325,21326,21327]},{"ID":79632,"Videos":[14595,14596,14597,14598,14599,14600,14601,14602,14603,14604,14605,14606,14607,14608,14609,14610,14611,14613,14614,14615,14612,14616,14617]}];

[21324,21325,21326,21327];

1.1

1