The zone for (1, 0) is bounded by walls
    0
The zone for (10, -5) is bounded by walls
    0
The zone for (-11, 13) is bounded by walls
    0
The zone for (1, 2) is bounded by walls
    0
The zone for (-4, -5) is bounded by walls
    0
The zone for (0, -18) is bounded by walls
    0
The zone for (12, 14) is bounded by walls
    0
The zone for (-1, -2) is bounded by walls
    0
The zone for (4, -12) is bounded by walls
    0