In this case, you need to be American to make sense of this. And possibly you need to have been to a US university. Took me years of seeing people put a confusi

In this case, you need to be American to make sense of this. And possibly you need to have been to a US university. Took me years of seeing people put a confusing number 101 on the end of guides on blogs or whatever before I realised that meant introduction to Americans.