Bug Report
https://issues.apache.org/jira/browse/COLLECTIONS-68
Source Code
http://archive.apache.org/dist/commons/collections/source/collections-3.1-src.zip
EvoCrash Target Frame
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java.util.ConcurrentModificationException
    at java.util.AbstractList.checkMod(AbstractList.java:455)
    at java.util.AbstractList.previousIndex(AbstractList.java:548)
    at java.util.AbstractList$SubList.previousIndex(AbstractList.java:1114)
    at org.apache.commons.collections.FastArrayList$SubList$SubListIter.previousIndex(FastArrayList.java:1206)
    at org.apache.commons.collections.FastArrayList$SubList$SubListIter.remove(FastArrayList.java:1222)

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