150 hours of recorded lectures

You can use whatever — you don't even have to just hit the modules. We tried to put things in units of six, because that's kind of what the students wanted, what edX wanted. Six hours of lectures. If you were to just take the 150 hours of lectures that are out there and just randomly pick 36 of them, not even in a coherent way, I would accept that. Because I think that there's actually content to be learned from each hour.