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Structure of the activity dataset. The records are sorted by device, stream, HDA, and activity
| device | tower | activity | stream | HDA |
|---|---|---|---|---|
| afa64 | 0052 | 5 | CDRs | MA |
| afa64 | 0056 | 3 | CDRs | MA |
| afa64 | 0012 | 1 | CDRs | MA |
| afa64 | 0052 | 2 | CDRs | DD |
| afa64 | 0056 | 1 | CDRs | DD |
| … | … | … | … | … |
