1 2 [3] 4 5 6 7 
1 2 [3] 4 5 6 7
|
| 1 2 [3] 4 5 6 7
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 2 [3] 4 5 6 7
| ||