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Educational systems. Teaching systems --- Open plan schools --- Interest centers approach to teaching --- Learning center approach to teaching --- Open classroom approach to teaching --- Open education --- Open schools --- Open-space plan schools --- Education --- Free schools --- Individualized instruction --- Experimental methods --- Open plan schools.

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Education --- -Liberty --- Power (Social sciences) --- Empowerment (Social sciences) --- Political power --- Exchange theory (Sociology) --- Political science --- Social sciences --- Sociology --- Consensus (Social sciences) --- Civil liberty --- Emancipation --- Freedom --- Liberation --- Personal liberty --- Democracy --- Natural law --- Equality --- Libertarianism --- Social control --- Children --- Education, Primitive --- Education of children --- Human resource development --- Instruction --- Pedagogy --- Schooling --- Students --- Youth --- Civilization --- Learning and scholarship --- Mental discipline --- Schools --- Teaching --- Training --- Philosophy --- Liberty. --- Philosophy. --- Power (Social sciences). --- Liberty

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Diagnostic ultrasonic imaging --- Fetus --- Congenital Abnormalities --- Fetal Diseases --- Prenatal Diagnosis --- Ultrasonography --- Abnormalities --- Diagnosis --- Diseases --- diagnosis