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import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Vector;
public class Main {
public static void main(String args[]) throws Exception {
Vector<String> v = new Vector<String>();
v.add("a");
v.add("b");
v.add("c");
Collection<String> col = v;
Enumeration<String> e = Collections.enumeration(col);
for (; e.hasMoreElements();) {
Object o = e.nextElement();
System.out.println(o);
}
}
}
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