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java.util.ConcurrentModificationException: 	at java.util.TreeMap$Iterator.next(TreeMap.java:1023)	at java.util.Collections$1.next(Collections.java:593)	at librarysubsystem.Action.bookUnavailable(Action.java:76)	at librarysubsystem.Action.setAvailability(Action.java:46)	at Application.run(Application.java:49)	at Main.main(Main.java:7)