Nothing
Choose the right answers:
| |Col_1 |Col_2|Col_3| |-----|------|-----|-----| |Row_1| 1 | 0 | 0 | |Row_2| 0 | 0 | 0 | |Row_3| 0 | 1 | 0 | |Row_4| 0 | 0 | 1 |
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