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Local changes in luminance-related cues , such as contrast at edges ( Nakayama et al ., 1990 ) and background luminance ( Anderson , 1999 ) , are also known to be critical in determining global surface properties . With so many students with advanced placement we are able to offer all our first two years of math courses in every quarter , allowing students start at the right level of math and continue with their math studies uninterrupted until all requirements are completed . On this latter aspect , Secretary Short recognized in her speech that " Rules of origin are critical in allowing developing countries to take full advantage of the preferences which are in principle available to them . Results of this research can be utilized to proactively schedule what maintenance task to perform on which machine in a way that is the least intrusive with the overall production or service process and therefore most cost-effective from the system point of view .