Hello! I've added the statements of a few more exercises from the first chapter (4, 5, 12); I will add more in the following days. Regarding the course, I have enjoyed your lecture notes as they are short, clear and insightful – thank you! I also try to keep up with the forum discussions: they are very instructive, but it takes some time to internalize everything. I went through some of the puzzles you posted, but I just didn't post my solutions, as there were already good answers.