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+The **trigger** sign triggers other signs when it is triggered.
+
+| Line | Input                     | Example |
+|------|---------------------------|---------|
+| 1st  | [Trigger]                 | [Door]  |
+| 2nd  | {ID}                      |         |
+| 3rd  |                           |         |
+| 4th  | [Trigger](signs#triggers) | R       |
+
+Sign trigger IDs must be unique. If the second line is left empty, an unused ID will be chosen automatically.