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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 expression family father force function government 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 spelling statement story students study support surface system table temperature times total trade united value volume water white world
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