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Given the following input file where you don't know what years are in it: id, year, status 1,1999,1 2,1999,1 1,2000,1 2,2000,2 1,2001,1 2,2001,2 1,2004,1
Desired output format: id, status 1999, status 2000, status 2001, status 2004 1,1,1,1,1 2,1,2,2,null