empty
empty
empty
X X X X X X X X X X
Y Y Y Y Y
Z Z Z Z Z
0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6 7 8 9
0.5 1.5 2.5 3.5 4.5
2 4 6 8 10
2 4 6 8 10
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)