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use strict ;
use warnings ;
...
7900724699,200906891,20180303,20180330
7900724699,200906892,20180404,20180430
7900724699,200906893,20180508,

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7900724666,200906888:200906888,20180406,20180720
7900724677,200906871:200906873,20180101,20180420
7900724688,200906881:200906883,20180101,20180620
7900724699,200906891:NULL,20180101,NULL