size 7

initial:
(0,6)=6
(3,3)=1
(5,1)=1
(6,3)=6

constraints:
(2,1)<(2,2)
(6,4)<(6,5)
(1,3)>(0,3)
(3,4)>(2,4)
(4,0)>(3,0)
(5,5)>(6,5)