A tray for ball grid array semiconductor packages is provided, composed of a body, protruding portions and positioning portions. A sidewall spacer is used as a mask to form a raised portion of a conductive layer. As more speakers are added, content is adaptively associated with that you speaker, and taken away from the previous. The cleaners contain other surfactants, and preferably also water and an organic acid. The method analyzes the data sets and computes distributions for the shared and distinct formation properties from which the formation properties are determined. In another aspect of the invention, the north and south poles of a cylinder and magnet assembly have unequal numbers of magnets.