Projective Plane of Order 3
	Points
Lines
1	1	2	3	4
2	1				5	6	7
3	1							8	9	10
4	1										11	12	13
5		2			5			8			11
6		2				6			9			12
7		2					7			10			13
8			3		5				9				13
9			3			6				10	11
10			3				7	8				12
11				4	5					10		12
12				4		6		8					13
13				4			7		9		11