Table 1. A typical pair-wise synergy between X1 and X2.
| Y | X1 | X2 | X1 ⊕ X2 |
|---|---|---|---|
| − | 1 | 1 | 0 |
| − | 0 | 0 | 0 |
| + | 1 | 0 | 1 |
| + | 0 | 1 | 1 |
⊕ is an exclusive-or operation.
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