Lec 1:
https://chatgpt.com/s/dr_680f02ded3208191b192046edc0457e0
Lec 2
https://chatgpt.com/s/dr_680f033673a8819180a1815e8f9ceba0
Lec 3
https://chatgpt.com/s/dr_680f031c2ebc8191841bf9a8b53bfd71
Lec 4
https://chatgpt.com/s/dr_6812f0a7628c81918993e44b64f206a9
Lec 5