group id date -------------------------- 1 1 2013-01-05 1 2 2013-01-06 1 3 2013-01-07 1 4 2013-01-08 2 3 2013-01-06 2 6 2013-01-09
group: 1 1 2 3 4 2013-01-05 2013-01-06 2013-01-07 2013-01-08
var
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