Make cannot deal with spaces in filenames.

Is make wrong, or is it your filename?

docs/Advent_of_Code_2017_December_4th.rst

@@ -0,0 +1,77 @@
+
+Advent of Code 2017
+===================
+
+December 4th
+------------
+
+To ensure security, a valid passphrase must contain no duplicate words.
+
+For example:
+
+-  aa bb cc dd ee is valid.
+-  aa bb cc dd aa is not valid - the word aa appears more than once.
+-  aa bb cc dd aaa is valid - aa and aaa count as different words.
+
+The system's full passphrase list is available as your puzzle input. How
+many passphrases are valid?
+
+.. code:: ipython2
+
+    from notebook_preamble import J, V, define
+
+I'll assume the input is a Joy sequence of sequences of integers.
+
+::
+
+    [[5 1 9 5]
+     [7 5 4 3]
+     [2 4 6 8]]
+
+So, obviously, the initial form will be a ``step`` function:
+
+::
+
+    AoC2017.4 == 0 swap [F +] step
+
+::
+
+    F == [size] [unique size] cleave =
+
+The ``step_zero`` combinator includes the ``0 swap`` that would normally
+open one of these definitions:
+
+.. code:: ipython2
+
+    J('[step_zero] help')
+
+
+.. parsed-literal::
+
+    0 roll> step
+    
+
+
+::
+
+    AoC2017.4 == [F +] step_zero
+
+.. code:: ipython2
+
+    define('AoC2017.4 == [[size] [unique size] cleave = +] step_zero')
+
+.. code:: ipython2
+
+    J('''
+    
+    [[5 1 9 5]
+     [7 5 4 3]
+     [2 4 6 8]] AoC2017.4
+    
+    ''')
+
+
+.. parsed-literal::
+
+    2
+