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action america american americans amount animal animals black blood business cause cells change changes chemical children circle class color control country definition describes determine difference earth energy equal equation family father force function government health heart house human identify increase information level light little living major matter middle money movement natural north object ocean oxygen people period person physical plant plants power president pressure process product provide question questions rights river school select sentence shape social solve sound south space specific speed spelling statement story students study support surface system temperature times total trade united value volume water white world
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