A computer-implemented process, computer program product, and apparatus for identifying session identification information. The system works by locating a plurality of phase shifters, including a first phase shifter and a second phase shifter, on a phase shifting mask, and then identifying a conflict area wherein a conflict is likely to occur between the first phase shifter and the second phase shifter on the phase shifting mask. The second assembly includes a steering gear and components for actuating the steering gear in response to the monitored rotation.