A lithographic projection apparatus is presented, which includes a housing, which comprises therein a first exposure system that has at least one movable part. In one exemplary embodiment, among others, a method includes receiving a first set of data packets and a first amount of forward error correction from an upstream transmitting device. The sidewall extends from the bottom wall, whereby the inner surfaces of the bottom wall and sidewall define a cavity for holding fluids or loose materials therein. The particular subset can be selected such that voice inputs provided by the user are more likely to include words from the subset. and thereby improves the durability and performance of those surfaces. This system will lead to lower treatment cost and quicker adjustments of the orthodontic bracket system.