Group curves

def grpCrvs(crv:var[]..[])
    {
    	dis1 = (crv.StartPoint)<1>.DistanceTo(crv<2>)==0
        ||(crv.EndPoint)<1>.DistanceTo(crv<2>)==0;
    	ind1 = List.AllIndicesOf(dis1<1>,true);
    	bln1 = true;
    	ind2 = [Imperative]
    	{
    		while (bln1)
    		{
    			cnt1 = List.Count(ind1);
    			ind1 = grpIndx(ind1);
    			cnt2 = List.Count(ind1);
    			bln1 = cnt2!=cnt1;
    		}
    		return = ind1;
    	}
    	crv1 = List.GetItemAtIndex(crv,ind2);
    	return = crv1;
    };
​
    def grpIndx(ind:var[]..[])
    {
    	ind1 = List.SetIntersection(ind<1>,ind<2>);
    	cnt1 = List.Count(ind1<1><2>)>0;
    	ind2 = List.FilterByBoolMask(ind,cnt1<1>)["in"];
    	ind3 = List.UniqueItems(List.Flatten(ind2<1>,-1)<1>);
    	ind4 = List.UniqueItems(List.Sort(ind3<1>));
    	return = ind4;
    };