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import java.util.NavigableSet;

import java.util.Set;

import java.util.TreeSet;

public class Example2 <T extends Set<? extends Number> & NavigableSet<? extends Number>>{

T get(T t) {

t.forEach(System.out::println);

return t;

}

public static void main(String[] args) {

Example2<TreeSet<Number>> e = new Example2<>();

TreeSet<Number> al = new TreeSet<>();

al.add(1);

al.add(2);

al.add(3);

System.out.println(e.get(al));

}