| name,age_group,category,city | |
| Alice,20-30,A,New York | |
| Bob,30-40,B,Los Angeles | |
| Charlie,20-30,A,Chicago | |
| Diana,40-50,C,Houston | |
| Eve,30-40,B,Phoenix | |
| Frank,20-30,A,New York | |
| Grace,40-50,C,Chicago | |
| name,age_group,category,city | |
| Alice,20-30,A,New York | |
| Bob,30-40,B,Los Angeles | |
| Charlie,20-30,A,Chicago | |
| Diana,40-50,C,Houston | |
| Eve,30-40,B,Phoenix | |
| Frank,20-30,A,New York | |
| Grace,40-50,C,Chicago | |