src/main/java/org/apache/commons/collections4/map/AbstractHashedMap.java [325:335]:
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        public void remove() {
            if (last == null) {
                throw new IllegalStateException(REMOVE_INVALID);
            }
            if (parent.modCount != expectedModCount) {
                throw new ConcurrentModificationException();
            }
            parent.remove(last.getKey());
            last = null;
            expectedModCount = parent.modCount;
        }
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src/main/java/org/apache/commons/collections4/map/AbstractLinkedMap.java [257:267]:
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        public void remove() {
            if (last == null) {
                throw new IllegalStateException(REMOVE_INVALID);
            }
            if (parent.modCount != expectedModCount) {
                throw new ConcurrentModificationException();
            }
            parent.remove(last.getKey());
            last = null;
            expectedModCount = parent.modCount;
        }
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