empty
empty
empty
A A A A A A A A A A
B B B B B
C C C C C
D D D D D
E E E E E
0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6 7 8 9
2 4 6 8 10
10 8 6 4 2
0.5 1.5 2.5 3.5 4.5
5.5 4.5 3.5 2.5 1.5
2 4 6 8 10
10 8 6 4 2
3 6 9
(0 0)(1 1)(2 2)(3 3)(4 4)(5 5)(6 6)(7 7)(8 8)(9 9)
(0 0)(1 1)(2 2)(3 3)(4 4)(5 5)(6 6)(7 7)(8 8)(9 9)
(0 0)(1 1)(2 2)(3 3)(4 4)(5 5)(6 6)(7 7)(8 8)(9 9)