A sun visor assembly includes a foundation folded unto itself to form first and second foundation halves. The method controls a process, such as a chemical process, by receiving measurement information relating to the process, applying rules to the received measurement information to determine a desired response, and sending control information to at least one device associated with the process, so as to modify the process. These wings are kept horizontal and vertical by pendular movement of the device about the antenna on which the device is fixed. Interacting linear and Boolean constraints are generated for the tag, and the set of constraints is solved using an HSAT solver to provide a vector that covers the tag.