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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 . 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 ) . “ A CAT scan consists of a sequence of x-rays of the body taken from many different angles . Each path consists of a sequence of certificates , starting with the certificate to be validated and ending with a trust anchor .