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import java.util.Map;

import java.util.NavigableMap;

import java.util.TreeMap;

public class Example3 <T extends Map<? extends String, ? extends Number > & NavigableMap<? extends String, ? extends Number >>{

T get(T t) {

t.forEach((k,v) -> System.out.println(k + " " + v));

return t;

}

public static void main(String[] args) {

Example3<TreeMap<String, Number>> e = new Example3<>();

TreeMap<String, Number> al = new TreeMap<>();

al.put("One", 1);

al.put("Two", 2);

al.put("Three", 3);

al.put("Four", 4);

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

}