Uncomment 💡 moment about set size

lib/koans/10_map_sets.ex

@@ -30,7 +30,7 @@ defmodule MapSets do
     # http://stackoverflow.com/a/40408469
 
     # What do you think this answer to this assertion is?
-    # assert sorted?(@set) == ___
+    assert sorted?(@set) == ___
   end
 
   koan "Does this value exist in the map set?" do

test/koans/map_sets_koans_test.exs

@@ -6,7 +6,7 @@ defmodule MapSetsTest do
     answers = [
       1,
       3,
-      false,
+      {:multiple, [false, true]},
       true,
       {:multiple, [true, false]},
       true,