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For example , for certain signals , it may be better to vary the sampling interval instead of sampling uniformly . Areas of reduced blood flow to the heart muscle — through which less of the radioactive material flows — appear as dark spots on the scan . A combination of the three structures discussed here - - donations , interlibrary loan , and lending libraries - - have served well in the past and can continue to serve in the future . When hundreds gather for the traditional four-hour service on Sunday mornings , it is almost like being in Egypt . RUL is working diligently to put in place the management framework and policies required in the critical areas of project creation , description , maintenance , and management . For example , heart attack symptoms in women , in older adults and in people with diabetes tend to be less pronounced . One hundred and twelve Deerfield men , women , and children were captured and taken on a 300-mile forced march to Canada in harsh winter conditions . These factors generally correspond to everyday situations : mistimed traffic signals , a blocked lane , the narrowing of a freeway to fewer lanes , a busy exit or entry ramp , a truck slowly grinding its way up a hill .