The invention provides processes for preparing intermediates useful for preparing compounds of the formula:or a salt thereof, where R1-3 are as defined in the specification. Each reflecting unit is composed of at least two reflection planes. Higher level performance indicators can be determined based on tower level state assessments. Characteristics include: workstation identifier; application; date and time of display; coordinates of screen data; window opening, closing, and scrolling; searching, copying, printing, and saving. The wall is made from wave penetrating material impregnated with a plurality of wave absorbing particles which are heated to the desired ablation temperature by the absorbed electromagnetic waves.