In one embodiment of the invention, a stacking element includes a printed circuit board and a plurality of solder bumps. The switch control signal recovery circuit has an auxiliary NFET switch whose current flow path is series-coupled with a Schottky diode between the output voltage of the next lower order stage and a PFET switch drive line. The purchase card may also be issued in connection with another credit card, for example as a rebate for purchases on the credit card. The wordline decoding circuitry includes a pre-decoder circuit for receiving a control signal and outputting logic outputs to wordline activation circuitry. The second group G2 consists of, in order from the object, a third lens L3 having positive power, a fourth lens L4 having negative power, and a fifth lens L5 having positive power.