import numpy as np
from scipy import ndimage


mask = np.array(
    [
        [0, 1, 1, 0, 0, 0],
        [0, 0, 1, 0, 1, 0],
        [1, 1, 0, 0, 0, 1],
        [0, 0, 0, 1, 1, 1],
    ],
    dtype=bool,
)