Add other lessons that don't work with answer system

lib/koans/03_atoms.ex

@@ -19,6 +19,22 @@ defmodule Atoms do
     assert list[:name] == ___
   end
 
+  #koan "Only atom keys may be accessed with dot syntax" do
+  #  map = %{name: "Jay"}
+  #  assert map.name == ___
+
+  #  map = %{"name" => "Jay"}
+  #  assert_raise KeyError, fn -> ___ end
+  #  assert map["name"] == ___
+  #end
+
+  #koan "Dot syntax is stricter than access with brackets" do
+  #  map = %{name: "Jay"}
+
+  #  assert map[:age] == ___
+  #  assert_raise KeyError, fn -> ___ end
+  #end
+
   koan "It is surprising to find out that booleans are atoms" do
     assert is_atom(true) == ___
     assert is_atom(false) == ___