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id begin_date end_date workplace student_id
1 2010-02-02 2010-04-02 131001 3
2 2010-04-02 2010-05-02 131003 3
3 2010-01-02 2010-02-02 131001 1
4 2010-02-02 2010-03-11 131004 1
5 2010-02-04 2010-03-22 131006 5
6 2010-03-02 2010-05-02 131006 7

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131001 2
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131003 0
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