An article of headwear, preferably of moisture absorbent cloth, having two narrow end sections and a wide middle section for covering the head and neck of a wearer. The disclosed contrast agents will have utility and magnetic resonance imaging and associated techniques. Additionally, a shaker screen including a frame and a sealing element attached to an outer perimeter of the frame, wherein the sealing element is attached by one selected from thermal bonding and co-molding is disclosed. A positioning mechanism selectively positions adapter relative to clamp assembly to establish a spatial relationship between them for enabling clamp assembly to be placed at a desired location on the dome wall and adapter to engage a valve handle. A mating connector has an insulating mating connector housing with a mating member receiving recess. In the third phase, the list of offsets is used to perform re-ordering on the list of data, according to the current radix symbol.