Drag and Drop Incorrect

Hi, newbie so sorry if this is obvious.I have a drag and drop exercise with multiple drag items and drop points, though each only has one correct location.Its informal - so what I want to do is when an item is dragged to the wrong location - I want to return it back to its original position - immediately. So that the item only sticks when it is in the correct location. By that method the student learns where each item fits.thanks

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