Pair Nearest

Pair nearest while avoiding reverse pairing (unique pairs)

s = PolyCurve.ByJoinedCurves(List.Shuffle(
(Rectangle.ByWidthLength(10..20..#5,5).Translate
(0..40..#5,0..40..#5,0))).Explode());

def cns(cr:var[]..[], oc:var[]..[])
{
	a = List.SetDifference(List.RestOfItems(cr),oc);
	b = cr[0].DistanceTo(a);
	c = List.SortByKey(a,b)["sorted list"];
	return List.FirstItem(c);
};

s;
nearestPairs = [Imperative]
{
	t = [];
	i = 0;
	while (List.Count(t)<List.Count(s))
	{
		d = cns(List.ShiftIndices(s,-i),t);
		t = List.AddItemToEnd(d,t);
		i = i + 1;
	}
	return List.Transpose([s,t]);
};
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