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id date_employment date_dismissal
1 2022-01-01 null
2 2022-02-20 null
3 2022-03-01 2022-06-01
4 2022-04-20 2022-05-01
5 2022-05-01 null
6 2022-06-01 null
month_start employees_amount
2021-12-01 0
2022-01-01 1
2022-02-01 2
2022-03-01 3
2022-04-01 4
2022-05-01 5
2022-06-01 5