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This exception has no message.
java.lang.NullPointerException: 	at java.util.TreeMap.compare(Unknown Source)	at java.util.TreeMap.put(Unknown Source)	at java.util.TreeSet.add(Unknown Source)	at java.util.AbstractCollection.addAll(Unknown Source)	at java.util.TreeSet.addAll(Unknown Source)	at java.util.TreeSet.(Unknown Source)	at MainClass.main(MainClass.java:33)