src/main/java/org/apache/commons/collections4/list/AbstractLinkedList.java [181:191]:
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        public E previous() {
            checkModCount();
            if (!hasPrevious()) {
                throw new NoSuchElementException("Already at start of list.");
            }
            next = next.previous;
            final E value = next.getValue();
            current = next;
            nextIndex--;
            return value;
        }
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src/main/java/org/apache/commons/collections4/list/AbstractLinkedListJava21.java [184:194]:
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        public E previous() {
            checkModCount();
            if (!hasPrevious()) {
                throw new NoSuchElementException("Already at start of list.");
            }
            next = next.previous;
            final E value = next.getValue();
            current = next;
            nextIndex--;
            return value;
        }
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