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Actually.

за + instrumental = behind (location)
за + accusative = (movement to) behind[/quote]

Oh yes, true! How could I forget the за + accusative!

"Забирай меня скорей, увози за сто...

За + instrumental is used to mean behind (something).

За зданием находится магазин.
There is a store behind the building.

Also, 3а + instrumental can be used to describe something you "seek."...