empty empty empty zero A 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 1 3 5 7 9 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) (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)(10 10) (0 0)(1 1)(2 2)(3 3)(4 4)(5 5)(6 6)(7 7)(8 8)(9 9)(10 10) (10 10)(9 9)(8 8)(7 7)(6 6)(5 5)(4 4)(3 3)(2 2)(1 1) (10 10)(9 9)(8 8)(7 7)(6 6)(5 5)(4 4)(3 3)(2 2)(1 1) (10 10)(9 9)(8 8)(7 7)(6 6)(5 5)(4 4)(3 3)(2 2)(1 1)(0 0) (10 10)(9 9)(8 8)(7 7)(6 6)(5 5)(4 4)(3 3)(2 2)(1 1)(0 0)