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What is the purpose of the extra set of 80 lessons below the originals?

Question asked by Cathy Elliott on Jul 13, 2019
Latest reply on Jul 14, 2019 by

There are an extra copy of 80 lessons below those for the class.  They have page icons on the right hand side next to the check boxes.  What are they there?  How would I use them?  An example of what one looks like (cropped).