from itertools import *
def view_calc(lst):
for i, item in enumerate(lst, 1):
print(item, end=' ')
if (i % 4) == 0:
print()
print()
view_calc(list(product(range(4), repeat=2)))
'''
run:
(0, 0) (0, 1) (0, 2) (0, 3)
(1, 0) (1, 1) (1, 2) (1, 3)
(2, 0) (2, 1) (2, 2) (2, 3)
(3, 0) (3, 1) (3, 2) (3, 3)
'''