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["Sales (invoiced)",5,13,23,8,7,5,25,5,20,22,24,12]
["Cost of goods sold",4,11,21,4,5,2,23,2,17,21,21,8]
["Gross profit",{"$f":"B2-B3","v":1},{"$f":"C2-C3","v":2},2,4,2,3,2,3,3,1,3,4]

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[null,"Jan","Feb","Mar"]
[null,"Jan","Feb","Mar"]