HOTSPOT
You define a class by using the following code:
To answer, complete each statement according to the information presented in the code.
Answer: 
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2, int
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the group clause returns an IGROUPING collection. this obj is a collection that contains a property for the key that the sequence is grouped by.
u can use a select clause when grouping sequences but must include an into clause in your group clause. the variable dp is of type IGROUPING that u can use in your select clause.
collection will contain 2 objects/groupings
key is int i.ebuildingID
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