CL=cut length if circle radius is 1
2 pieces	3 pieces	4 pieces	5 pieces	6 pieces
			Cox 2006
CL=2	CL=3	CL=3.9289+	CL=4.8338+	CL=5.4068+
7 pieces	8 pieces	9 pieces
		Cox 2006	Cox has candidates up to 43 pieces
CL=6	CL=6.6472+	CL=7.3149+
	WarrenD.Smith has found a general formula for the cases with one island in the middle (not all are optimal). See his formula below.
Non optimal solutions				see also: Simon Cox
4 pieces
CL=4.4880+	CL=4.8900+	CL=7.3346+
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