src/main/java/org/apache/commons/collections4/list/AbstractLinkedList.java [281:294]:
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        public boolean addAll(final int index, final Collection<? extends E> coll) {
            rangeCheck(index, size + 1);
            final int cSize = coll.size();
            if (cSize == 0) {
                return false;
            }

            checkModCount();
            parent.addAll(offset + index, coll);
            expectedModCount = parent.modCount;
            size += cSize;
            modCount++;
            return true;
        }
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src/main/java/org/apache/commons/collections4/list/AbstractLinkedListJava21.java [280:293]:
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        public boolean addAll(final int index, final Collection<? extends E> coll) {
            rangeCheck(index, size + 1);
            final int cSize = coll.size();
            if (cSize == 0) {
                return false;
            }

            checkModCount();
            parent.addAll(offset + index, coll);
            expectedModCount = parent.modCount;
            size += cSize;
            modCount++;
            return true;
        }
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