not recorded
lec 17
https://drive.google.com/file/d/1fPDMk0P0SKvJ_wVzJ1wRArkxEhmkyUZG/view?ts=5fc75098
lec 18
https://drive.google.com/file/d/1elUyLeFPOGZNEpxPZo_lFFutjzjjxnC8/view
lec 19
https://drive.google.com/file/d/1DlATcDJTG6CSSyCshctgJlVoH-Mpz9R9/view?ts=5fca4d7c
lec 20
https://web.microsoftstream.com/video/195d7312-a16c-44f4-a88d-d30fcf629063?referrer=https:%2F%2Fteams.microsoft.com%2F
lec 21
https://web.microsoftstream.com/video/134f2ff4-16ed-46ba-99e6-9c69323f63f5
le 22
https://web.microsoftstream.com/video/1adc671e-fb39-4e47-90a1-54ccf54913a9
lec 23
https://web.microsoftstream.com/video/fec053c6-887f-4dc8-8f8e-d142ce029156
lec 24
https://web.microsoftstream.com/video/10d28a2d-f5d9-4c30-aafa-cb7f3c689b8e
lec 25