A method and apparatus for controlling compartmentalization of a cache memory. The watermark comprises at least one basis pattern. This formulation minimizes the variation between peak and trough plasma levels of valproate over a 24 hour dosing period. The blow mold has partial walls between the two cavities, which provide directional control over the preforms as the preform wall portions are blown against and contact welded to each other. Further, the wiring connections on the second level substrate provide signal paths to transfer signals to the desired input function and signals from the desired output function, and signals to and from the common functions.