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In addition , in the case of cardiovascular stress testing , for example , a series of CPT codes ( 93015-93018 ) have been developed to accurately describe the services provided . In the vicinity of Santa Barbara and Los Angeles , a series of large offshore islands provide sheltering effects within the Santa Barbara Channel and Passage , the San Pedro Channel , and the Gulf of Santa Catalina . Upon China 's entry , a series of market-opening and tariff-reducing measures will take effect , a process expected to continue for many years ( see accompanying box ) . Also , for each topic , a series of books are available , which can be purchased .