When Oski is already reading the notes, with probability a he will decide to switch gears and work on a practice problem, and otherwise, he will decide to keep reading more notes. Conversely, when Oski is already working on a practice problem, with probability b he will think of a topic he needs to review, and will decide to switch back over to the notes; otherwise, he will keep working on practice problems. Assume that (unlike real life, we hope!) Oski never runs out of work to do.

Required:
Draw a 2-state Markov chain to model this situation.