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java.util.ConcurrentModificationException: 	at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1231)	at java.util.ArrayList$SubList.listIterator(ArrayList.java:1091)	at java.util.AbstractList.listIterator(AbstractList.java:299)	at java.util.ArrayList$SubList.iterator(ArrayList.java:1087)	at java.util.AbstractCollection.toString(AbstractCollection.java:454)	at java.lang.String.valueOf(String.java:2981)	at java.io.PrintStream.println(PrintStream.java:821)	at undefined.Player.getRank(Player.java:22)	at undefined.GameEngine.nextTurn(GameEngine.java:32)	at undefined.GameEngine.main(GameEngine.java:27)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)