6 6 ___..--' \ ___..--' \ 4 [] 4 [] __..-' `._ ____....---' `._ 2,p 5 => 2,p 5 _.-' \ _' \ _.-' `._ _' \ 1 [4] [4] [6] 1 3,n [4] [6] / \ / \ _' \ [] [2] [] [2] [2] [4]