i
j
0
0
1
0
2
0
3
0
0
−1
1
−1
2
−1
0
−2
1
−2
0
1
| i | j |
|
| 0 | 0 |
|
| 1 | 0 |
|
| 2 | 0 |
|
| 3 | 0 |
|
| 0 | −1 |
|
| 1 | −1 |
|
| 2 | −1 |
|
| 0 | −2 |
|
| 1 | −2 |
|
| 0 | 1 |
|