java.util.ConcurrentModificationException

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  • java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) at java.util.ArrayList$Itr.next(ArrayList.java:831) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:34) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.fcBacktrack(FCBacktrack.java:44) at src.FCBacktrack.solve(FCBacktrack.java:21) at src.GraphColorer.main(GraphColorer.java:75) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

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