Versions of local copies:
- cmudict: 0.7b. Retrieved May 28, 2018.
- kilgarriff: Retrieved May 28, 2018.

Sources:
- https://cmloegcmluin.wordpress.com/2012/11/10/relative-frequencies-of-english-phonemes/
- http://www.speech.cs.cmu.edu/cgi-bin/cmudict
- http://www.kilgarriff.co.uk/bnc-readme.html

To do:
. use more than just first pronunciation in cmudict
. <er> is one phoneme etc
. phone or phoneme?
. manual error checking
. transcribe some of the uncorrelateds
. reread cmloegcmluin
x ARPAbet -> IPA

Changelog:
- v0.3.0: Various
  - Add local copies of source data and results
  - Default to local copies
  - Move all data files into subdirectories
  - Add MIT license
  - Refactor: Move file paths out of Python and into Makefile

- v0.2.0: Translate ARPAbet to IPA

- v0.1.0: First steps; Frequencies generally and post-/w/
  - Processing:
    - Use only the first pronunciation in cmudict
    - Discard uncorrelateds entirely
    - No manual error checking etc
  - Results:
    - Q1: Frequencies of phonemes generally
    - Q2: Frequencies of phonemes post-/w/