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["Наименование","Цена1","Цена2"]
["Позиция 1",100,400]
["Позиция 2",200,500]
["Позиция 3",300,600]
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[null,"Наименование","Позиция 3"]
[]
[null,"Сумма по полю Цена1","Сумма по полю Цена2"]
[null,300,600]