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["Invoice number","customer no","invoice date","due date","currency","currency rate","item no","quantity"]
[1.0,1.0,"2017-04-21","2015-05-21","EUR",1.0,1.0,20.0]
[{"$nulls":5},1.0,2.0,30.0]
[{"$nulls":5},1.0,3.0,40.0]
[2.0,2.0,"2017-04-21","2015-05-21","EUR",1.0,5.0,50.0]
[3.0,2.0,"2017-04-21","2015-05-21","EUR",1.0,1.0,10.0]
[4.0,3.0,"2017-04-21","2015-05-21","EUR",1.0,6.0,60.0]