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The central notion of this area is the so-called algorithmic entropy ( description complexity ) of a string : the length of the shortest program that can cause the computer to output this string . A key feature of this area is the number of inholdings scattered throughout the area . Another feature of this area is the relic Columbia Southern irrigation canal system , which winds through the southern portion of this area . But it can be argued that a better measure of the ' urbanization ' of an area is the amount of light that it emits at night .