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["Товар","Дата","Магазин","Количество продаж"]
["Ручки","2016-01-01","Магазин 1",22]
[null,null,"Магазин 2",16]
[null,null,"Магазин 3",14]
[null,null,"Магазин 4",13]
["Карандаши","2016-01-01","Магазин 1",30]
[null,null,"Магазин 2",27]
[null,null,"Магазин 3",15]
[null,null,"Магазин 4",28]
["Фломастеры","2016-01-01","Магазин 1",10]
[null,null,"Магазин 2",5]
[null,null,"Магазин 3",7]
[null,null,"Магазин 4",2]
["Ручки","2016-01-02","Магазин 1",22]
[null,null,"Магазин 2",5]
[null,null,"Магазин 3",14]
[null,null,"Магазин 4",23]
["Фломастеры","2016-01-02","Магазин 1",10]
[null,null,"Магазин 2",15]
[null,null,"Магазин 3",17]
[null,null,"Магазин 4",2]

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[null,"Ручки","Карандаши","Фломастеры"]
["01.01.2016",65,100,24]
["02.01.2016",64,null,44]