A nested and grouped Bar chart

This is a variation on the already existing nested Bar chart, this one with the nested Bar chart being grouped.

[No canvas support]

This goes in the documents header: 
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.key.js"></script>
<script src="RGraph.line.js"></script>
Put this where you want the chart to show up: 
<canvas id="cvs" width="700" height="250">
    [No canvas support]
</canvas>
This is the code that generates the chart: