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["источник","Продукт","Ед. измерения","Кол-во",null,null,null,null,"Сумма по полю Кол-во",null,"Названия столбцов"]
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["1.xlsx","арбуз","кг",25,null,null,null,null,"виноград","кг",15,10,6,null,31]
["2.xlsx","мандарин","кг",5,null,null,null,null,"мандарин","кг",10,5,5,null,20]
["2.xlsx","виноград","кг",10,null,null,null,null,"черешня","кг",null,null,15,null,15]
["2.xlsx","арбуз","кг",16,null,null,null,null,"яблоко","кг",null,25,26,null,51]
["2.xlsx","яблоко","кг",25,null,null,null,null,"(пусто)","(пусто)"]
["3.xlsx","мандарин","кг",5,null,null,null,null,"Общий итог",null,50,56,127,null,233]
["3.xlsx","виноград","кг",6]
["3.xlsx","арбуз","кг",75]
["3.xlsx","черешня","кг",15]
["3.xlsx","яблоко","кг",26]