y   brand   car  position
30   B        1    1
36   A        1    2
25   C        1    3
22   D        1    4
24   D        2    1
34   C        2    2
18   A        2    3
15   B        2    4
35   A        3    1
30   D        3    2
15   B        3    3
28   C        3    4
32   C        4    1
24   B        4    2
13   D        4    3
14   A        4    4