This is a bit confusing; sorry about that.
The CM3215 Transport Lab meets on Monday for a one-hour lecture, and has two more meetings, a two-hour meeting on Tuesday (or sometimes on Thursday) and an additional one-hour lab meeting on Wednesday.
To sign up for CM3215 you must sign up for the lecture (section 0A) which is on Mondays, and for the lab, which has two meetings, Tuesday (or Thursday) and Wednesday (the lab will be L01, L02, etc.).
If you do not sign up for both parts, you will get a “linked course error” telling you that you have missed one of the parts.
To recap, you will attend class on Monday and Wednesday at the same time of day in a classroom with everyone who is taking the class. In addition, you will be in the Brozzo Laboratory (19-103) for a two-hour session one day a week, at a time that depends on which lab section you take.