import java.util.*;
import java.lang.*;
import java.io.*;
class MapKeys {
public static void main
(String a
[]){ //add key-value pair to TreeMap
hm.put("first", "FIRST INSERTED");
hm.put("second", "SECOND INSERTED");
hm.put("third","THIRD INSERTED");
Set<String> keys = hm.keySet();
}
}
}
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