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import java.util.Map;

import java.util.NavigableMap;

import java.util.TreeMap;

public class Example5<T extends Map<? super String, ? super Number > & NavigableMap<? super String, ? super Number >> {

T get1(T t1, String s, Number n) {

t1.put(s, n);

return t1;

}

public static void main(String[] args) {

Example5<TreeMap<String, Number>> e1 = new Example5<>();

TreeMap<String, Number> al1 = new TreeMap<>();

e1.get1(al1, "One", 1);

e1.get1(al1, "Two", 2);

e1.get1(al1, "Three", 3);

e1.get1(al1, "Four", 4);

e1.get1(al1, "Five", 5).forEach((k,v) -> System.out.println(k + " " + v));

System.out.println("al = " + al1);

}