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import java.util.Iterator;
import java.util.TreeMap;
import java.util.Set;
public class Main {
public static void main(String[] args) {
TreeMap<String, String> treeMap = new TreeMap<String, String>();
treeMap.put("1", "One");
treeMap.put("3", "Three");
treeMap.put("2", "Two");
Set st = treeMap.keySet();
Iterator itr = st.iterator();
while (itr.hasNext()){
System.out.println(itr.next());
}
st.remove("1");
System.out.println(treeMap.containsKey("1"));
}
}
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