#1Z8orgj1 (Python)

import numpy as np

def get_mat(L:int)->np.ndarray:
    N = L * 2 + 1
    mat = np.zeros(N) - np.identity(N)
    idx = np.arange(N-1)
    idy = idx + 1
    mat[idx[:L], idy[:L]] = 1/3
    mat[idx[L:], idy[L:]] = 2/3
    mat[idy[:L-1], idx[:L-1]] = 2/3
    mat[idy[L-1:], idx[L-1:]] = 1/3
    return mat

for i in range(11):
    mat = get_mat(i)
    det = np.linalg.det(mat)
    mat_inv = None
    if det != 0:
        mat_inv = np.linalg.inv(mat)
    print(mat, mat_inv)