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java.util.ConcurrentModificationException: 	at java.util.ArrayList$SubList.checkForComodification(ArrayList.java:1231)	at java.util.ArrayList$SubList.size(ArrayList.java:1040)	at week04.MergeSort.mergesort(MergeSort.java:17)	at week04.test.MergeSortTest.testMergesortUnsortedList(MergeSortTest.java:42)