java.lang.NullPointerException: This exception has no message.
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java.lang.NullPointerException:
at ExistentialistTreeFromFile.newExistTree(ExistentialistTreeFromFile.java:23)
at ExistentialistTreeFromFile.
(ExistentialistTreeFromFile.java:10) at ExistentialistTreeTester.main(ExistentialistTreeTester.java:11)