protonj2/src/main/java/org/apache/qpid/protonj2/engine/util/LinkedSplayMap.java [184:196]:
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        public void remove() {
            if (lastReturned == null) {
                throw new IllegalStateException();
            }
            if (modCount != expectedModCount) {
                throw new ConcurrentModificationException();
            }

            delete(lastReturned);

            expectedModCount = modCount;
            lastReturned = null;
        }
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protonj2/src/main/java/org/apache/qpid/protonj2/engine/util/SplayMap.java [921:933]:
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        public void remove() {
            if (lastReturned == null) {
                throw new IllegalStateException();
            }
            if (modCount != expectedModCount) {
                throw new ConcurrentModificationException();
            }

            delete(lastReturned);

            expectedModCount = modCount;
            lastReturned = null;
        }
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