Systems and methods for automated testing andor training of a subject’s visual ability at varying distances are provided. With the method and apparatus, instructions that include a memory reference to a local variable that is not modified by other instructions are identified. At least one characteristic variable of the pressure source is determined and these characteristic variables are compared to each other and a conclusion is drawn as to the presence of a leak from the result of the comparison. A separate index is generated that includes an inverted list of the documents and the terms in the anchor text. The 550-amino acid CPMO polypeptide encoded by the gene was found to have 36. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.