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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _pg_initchart function initializes the presentation-graphics
     package. It initializes the color and style pools, resets the
     chartline style set, builds default palette modes, and reads the
     font definition from the disk.
 
     The _pg_initchart function is required in all programs that use
     presentation graphics. This function must be called before any of
     the other functions in the presentation-graphics library. Note
     that the _pg_initchart function can only be called after using
     the _setvideomode function to establish the video mode. Also,
     _pg_initchart must be called after each change of the video mode.
 
     The _pg_initchart function assumes a valid graphics mode has been
     established. Therefore, it must be called only after a successful
     call to _setvideomode. Also, _pg_initchart must be called after
     each call to _setvideomode.
 
     Return Value
 
     The _pg_initchart function returns 0 if there were no errors. A
     nonzero value indicates a failure.
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