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spec: A change log file contains a chronological record of when and why you have changed a program , consisting of a sequence of entries describing individual changes . Each MPEG-4 elementary stream consists of a sequence of Access Units ; examples of an Access Unit ( AU ) are an audio frame and a video picture . “ A CAT scan consists of a sequence of x-rays of the body taken from many different angles . CDC expects to publish the results of this first population-based prevalence study later this year . Each path consists of a sequence of certificates , starting with the certificate to be validated and ending with a trust anchor . This is completely proveable . With the exception of component state transfer , the rest of the swapping process does not require support from the component , simplifying the addition of components that wish to take advantage of the hot-swapping capability . There are literally thousands of tourism-based businesses in this city and surrounding areas . As a consequence of the above definitions , the content of a layout schema consists exactly of a sequence of zero or more nonoverlapping elements which are its arguments ( possibly with intervening whitespace , which is ignored in MathML ) . By January , Kim says , the array will have some 12,500 genes represented on it , each one designed to produce a spot of fluorescence when exposed to a sample containing RNA messages from the corresponding gene .