Case | Row k |
| Row m |
| Dot Product |
| column x | column y | column x | column y | Row k. Row m |
1) | −1 | 1 | 1 | 1 | 0 |
2) | 1 | −1 | −1 | 1 | 0 |
3) | −1 | −1 | 1 | −1 | 0 |
4) | 1 | 1 | −1 | 1 | 0 |