10.3 Sample Bidirectional Relations
Consider these relations. Each one has a bidirectional relation that always goes with it. Responding to a relation in one direction (the IF column) entails responding to the relation in the other direction (the THEN column).
| IF | THEN |
|---|---|
| A is smaller than B | B is bigger than A |
| A comes before B | B comes after A |
| A is the cause of B | B is the effect of A |
| A is behind B | B is in front of A |
| A is the same as B | B is the same as A |
| A is in B | B contains A |
| A is better than B | B is worse than A |
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