
2

# 0 <= x <= 10,  0 <= y <= 4
4 4
1 1 0 0
1 -1 0 10
1 0 1 0
1 0 -1 4

# 6 <= x <= 12,  -2 <= y <= 8
4 4
1 1 0 -6
1 -1 0 12
1 0 1 2
1 0 -1 8

