Incremental selection & addition
					15				9				9						[3] [4] (3,4) (4,3) [2] (2,4) (4,2)      (2,3) (3,2) [1] (1,2) (2,1)      (1,4) (4,1) (1,3) (3,1) [5] (5,3) (3,5)       (4,5) (5,4)
		11							15				18
		10			12								27				11
		8			16				25								10
									12				8