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spec: They went to war with the Dutch , who at this time had a very famous admiral called Van Tromp . The decline in metals may be due to federal clean-water and air regulations imposed in the early 1970s that have limited pollution discharges by industries and cities , according to Margaret Dutch , who led the study for Ecology . As near as we can tell , the answer is '' it depends . A feel might be " funky " or " somber " ; durations are typically between ten and thirty seconds ; and purposes include a " teaser " to announce an upcoming show or an " open " to start it .