they add up to a substantial chunk of thinking, we won't officially
require you to do them, since we don't want to get into a bureaucratic
bind if you've planned your next month in a way that would not permit
-you to get the work done. But we strongly encourage you to work on
+you to get the work done. But ***we strongly encourage*** you to work on
the problem set: solving these problems will produce a qualitatively
deeper understanding of continuations. If you plan to do some or all
of these problems, and would like us to take them into account in our