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Nongraded schools --- Education --- Educational innovations --- Public health --- Ecoles par classes d'âge --- Enseignement --- Santé publique --- Experimental methods --- Méthodes expérimentales --- Innovations

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Junior high schools --- Nongraded schools --- Multi-age grouping --- Non-graded schools --- Schools, Nongraded --- Schools, Ungraded --- Ungraded schools --- Ability grouping in education --- Education --- High schools, Junior --- Intermediate schools --- Schools --- Middle schools --- Experimental methods