In an independent GaN film manufactured by creating a GaN layer on a base heterosubstrate using vapor-phase deposition and then removing the base substrate, owing to layer-base discrepancy in thermal expansion coefficient and lattice constant, warp will be a large \xb140 \u03bcm to \xb1100 \u03bcm. The apparatus has a set of wheel assemblies that can be independently driven and can be omni-directional to allow the apparatus to move in any longitudinal, lateral, or diagonal direction for excellent maneuverability. The toolkit inherits the Abstract Window Toolkit and Swing classes. Like poles of adjacent magnets face one another such that each pair of adjacent magnets repel one another and define a mixing pocket that is in communication with the channel.