-# A set is a container like a list or a dict, except that *each element can be stored only once*.
-# Think of it like the keys of a dict, except there isn't any value associated with each key.
-# I use Sets to count digits below. Feel free to look up the Set online and try it in the
-# interpreter.
+# Don't worry: you didn't miss anything if you don't know what a set is. We
+# didn't teach it, but if you are reading this, you get a bonus!
+
+# A set is a container like a list or a dict, except that *each element can be
+# stored only once*. Think of it like the keys of a dict, except there isn't
+# any value associated with each key. I use Sets to count digits below. Feel
+# free to look up the Set online and try it in the interpreter.