A collapsible bed frame that supports a box spring includes side rails and telescoping cross rails. A location of a user operated mobile device is determined and mapping information of a target area associated with the location of the user operated mobile device is retrieved. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way. In order to split the array, the highest order bit in the array is utilized to uniquely identify addresses of the first and the second threads. The cover plate also has a locking extension with at least one locking edge at a distal end. A teaching aid is provided that functions to expedite the teaching and learning of proper flip turn mechanics by providing an object for a swimmer to place hisher hands on and press down for support, tactile feedback and spatial orientation as the swimmer learns to initiate and perform a proper flip turn.