Some embodiments include methods of forming photomasks. Calls that are identified and indicated to be undesirable, as from a facsimile machine, may be categorically screened on the basis of character. The power level of a mobile station is determined based on the selected power control mode. The difference of a signal characteristic between a reference code signal monitored at the base station and the reply signal received by the base station is then determined. These may be the same or different from the set of vertices.