www/HACKING.rst
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   147 Pronunciation variants marked by:
   147 Pronunciation variants marked by:
   148 
   148 
   149 * ``Am`` - American
   149 * ``Am`` - American
   150 * ``Br`` - Great Britain
   150 * ``Br`` - Great Britain
   151 * ``Au`` - Australian
   151 * ``Au`` - Australian
       
   152 
       
   153 ``rare`` attribute to first headword used as marker that word has low frequency.
       
   154 SRS file writers skip entries marked as ``rare``. I found it convenient to check
       
   155 frequency with:
       
   156 
       
   157 https://books.google.com/ngrams/
       
   158   Google N-grams from books 1800-2010.
       
   159 
       
   160 For cut-off point I chose ``beseech`` word. All less frequent words receive
       
   161 ``rare`` marker.
   152 
   162 
   153 C5 dictionary source file format
   163 C5 dictionary source file format
   154 ================================
   164 ================================
   155 
   165 
   156 For source file format used dictd C5 file format. See::
   166 For source file format used dictd C5 file format. See::