6 0
7
6
5
4
3
2
1
0 7 6 5 4 3 2 1
x 2 3
x x
x 4
x x
t x 1
T t t
0 0 t 0 T 0 T 0
1 1
x 1
x x
x 5
x x
x 6
x x
x 7
1 x
1 1
1
2 x
2 x
2 2
2
3 x
3 x
3 3
3
4 x
4 x
4 4
4
5 x
5 x
5 5
5
6 x
6 x
6 6
6
7 x
7 x
7 7
7