lst_3d = [[[10, 18, 7, 23, 22, 30],
[1, 13, 16, 15, 25, 6],
[13, 26, 22, 14, 3, 6],
[29, 10, 1, 6, 10, 20]],
[[11, 15, 2, 29, 5, 20],
[7, 22, 26, 30, 23, 3],
[5, 26, 17, 9, 24, 24],
[10, 7, 12, 11, 21, 16]],
[[30, 17, 13, 3, 13, 17],
[6, 29, 3, 19, 11, 30],
[17, 22, 6, 2, 24, 16],
[4, 24, 8, 26, 7, 7]]]
lst_2d = [element for n in lst_3d for element in n]
print(lst_2d)
'''
run:
[[10, 18, 7, 23, 22, 30],
[1, 13, 16, 15, 25, 6],
[13, 26, 22, 14, 3, 6],
[29, 10, 1, 6, 10, 20],
[11, 15, 2, 29, 5, 20],
[7, 22, 26, 30, 23, 3],
[5, 26, 17, 9, 24, 24],
[10, 7, 12, 11, 21, 16],
[30, 17, 13, 3, 13, 17],
[6, 29, 3, 19, 11, 30],
[17, 22, 6, 2, 24, 16],
[4, 24, 8, 26, 7, 7]]
'''
