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For more information see: L<http://www.plainlanguage.com/Resources/readability.html>


=head2 fog

Returns the Fog index for the analysed text file or block.

  ( words_per_sentence + percent_complex_words ) * 0.4

The Fog index, developed by Robert Gunning, is a well known and simple
formula for measuring readability. The index indicates the number of years
of formal education a reader of average intelligence would need to read the
text once and understand that piece of writing with its word sentence workload.

   18 unreadable
   14 difficult
   12 ideal
   10 acceptable
    8 childish