| ERROR | rule string.string already in rule set string.string |
| CAUSE | a rule can be added to a rule set only once |
| ACTION | do not add a rule to a rule set that already contains this rule |
| ERROR | rule string.string already in rule set string.string |
| CAUSE | a rule can be added to a rule set only once |
| ACTION | do not add a rule to a rule set that already contains this rule |