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In his methodological essays , Inkeles has pointed out three traditional perspectives for regarding national character as a nation 's typical institutional patterns ( political , social , economic ) ; as a history of behavior and actions ; and as cultural themes ( values , religions , ethos , the arts ) . Also : the Democratic Party has a bedrock of three economic factions , union labor , urban professionals ( usually lawyers ) and public servants . One such study of older nondisabled persons found that three short tests of physical performance abilities strongly predicted disability as much as four years in advance . The mill was operated three 8-hour shifts , seven days a week . Students will be assigned three short essays on specific plays and will write a longer final paper on a topic addressed by the playwrights of in the course . The mine was operated three 8-hour shifts , seven days a week .