crap.py

i = 0
j = 0
for i in range(0, 10):
    print((i % 2) * "  ", end=" ")
    for j in range(0, 4 - i % 2):
        print((i % 2 + j * 2, 4 + j - i // 2), end=" ")
    print()

# (0, 4) (2, 5) (4, 6) (6, 7) 
#    (1, 4) (3, 5) (5, 6) 
#  (0, 3) (2, 4) (4, 5) (6, 6) 
#    (1, 3) (3, 4) (5, 5) 
#  (0, 2) (2, 3) (4, 4) (6, 5) 
#    (1, 2) (3, 3) (5, 4) 
#  (0, 1) (2, 2) (4, 3) (6, 4) 
#    (1, 1) (3, 2) (5, 3) 
#  (0, 0) (2, 1) (4, 2) (6, 3) 
#    (1, 0) (3, 1) (5, 2)