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