- finish up 17.atomic_messages.pd

- make new exercise in 26.EXERCISE.hmmmm

- in pure_data_files.pd, make the patch create [pd clone] dynamically,
  probably like how send_messages_to_pd.pd does it.

- in pure_data_files.pd, make the patch reset itself once it finishes the
  clone. (remember that [pd clone] has to be the last object.)

- make looping sequence

- 20.inlets_and_outlets: explain the message building, prepend, add2, set,
     etc.  probalby, I should make a patch or two before that about message
     buildling



---------------
Unsorted topics
---------------

- math
- init to 0
- comparing numbers
- expr
- creation arguments


- selecting events ([select])
- sorting_messages_by_selectors ([route])
- sorting_messages_by_atom ([route])

- storing a number globally ([value])

- building lists (pack and unpack, arguments)
- list2symbol

- trigger conversions
- symbol conversion

- keywords

- number limitations

- more on timing

- building lists
- using lists (unpack, lists replacing inlets)

- writing objects in Pd (abstractions)

- loading libraries
- namespaces
- import

- multiple messages
- sends and receives
- sends in a message box

- Example: parazit
- send messages to Pd
- pure data files



data structures tutorial?