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| registered_at | alarm_triggered |
|---|---|
| 2012-07-15 06 | 2 |
| 2012-07-15 07 | 1 |
| 2012-07-15 08 | 0 |
| registered_at | alarm_triggered |
|---|---|
| 2012-07-15 06 | 2 |
| 2012-07-15 07 | 1 |
| 2012-07-15 08 | 0 |