The invention concerns a xylenes isomerization process for the production of equilibrium or near-equilibrium xylenes from a feedstream comprising phenol andor styrene. The predicted yaw rate can be generated by sending the measured yaw rate through a lead filter. The client portion encrypts each electronic document and produces a list of terms of interest relating to the document, which terms are also encrypted. The number of mask cells is smaller than that of the data storage cells.