Vertical 3D bar chart with mixed stacked & parallel bars

Source code

    Chart Features
    --------------
    This is a simple vertical 3D barchart with mixed stacked & parallel bars

    - The attributes which control the label position in this case are
      **chart.categoryAxis.style='mixed' and .chart.seriesOrder=((0,),(0,1))
      The mixed style uses seriedOrder to determine both sequence and structure, 
      each subtuple indicates a stacked bar, the integers indicate
      which series is used. Series may be repeated, missing series are added at
      the end as unstacked bars.

    This chart was built with our
       [Diagra](http://www.reportlab.com/software/diagra/) solution.

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