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I want a polygon that contains all points per group. (postcode)

BUT the polygon may NOT contain points from another group.

I want the maximum area. but it must not overlap.

I have used the HullAccumulator but I get an overlap with that.

the red line is what i want.

For this sort of scenario I'd use a VornoiDiagrammer to create polygons round each point, and then dissolve based on postcode to create postcode areas

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