The third exercise focuses on "the row" where one must use a fixed sequence of notes, and repeats are allowed.
In addition, I also learned a few tricks with Finale and the Garritan samples. Figured out how to lock it to 4 bars per line - been working on 12 bars as standard - and that using the "Notation" version of the instruments e.g. n-flute plr 1 vs flute plr 1 - it's the correct instrument for use with Finale, and allows the articulations like legato and staccatos to be properly played back.
Lucky read on the garritan forums - wonder if its the same for other scoring programs as well.