What you need is the ability to group separately by two classifiers, one for marker symbol, one for marker color. This is NOT supported for SCATTER plot, but IS supported in SERIES plot. You can use SERIES plot with markers and set line thickness=0. Then, you can use the GROUP, GROUPMC and GROUPMS to control the marker color and symbols separately. Remember to use a Style with Attrpriority=none, or set Attrpriority=none in the ODs Graphics statement to see the different marker symbols.
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