from copy import copy
from pprint import pprint

num_2d = [[1, 2, 3, 4, 5], [2, 3, 4, 5, 6], [3, 4, 5, 6, 7], [4, 5, 6, 7, 8]]

print(num_2d)
pprint(num_2d)
print(num_2d[1][2])
letters = ["a", "b", "c", "d"]
letters_2d = [copy(letters), copy(letters), copy(letters)]
letters_2d[1][0] = "e"

pprint(letters_2d)
