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NAME | DATE_1 | VAR |
---|---|---|
john | 2010-01-01 | b |
john | 2012-02-01 | b |
john | 2017-08-01 | b |
sara | 2008-04-01 | c |
sara | 2011-04-01 | c |
tim | 2000-01-01 | null |
tim | 2001-01-01 | null |
alex | 2013-01-01 | null |