src/main/java/org/apache/commons/collections4/set/AbstractNavigableSetDecorator.java [89:111]:
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    @Override
    public E higher(final E e) {
        return decorated().higher(e);
    }

    @Override
    public E lower(final E e) {
        return decorated().lower(e);
    }

    @Override
    public E pollFirst() {
        return decorated().pollFirst();
    }

    @Override
    public E pollLast() {
        return decorated().pollLast();
    }

    @Override
    public NavigableSet<E> subSet(final E fromElement, final boolean fromInclusive, final E toElement,
            final boolean toInclusive) {
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src/main/java/org/apache/commons/collections4/set/PredicatedNavigableSet.java [119:141]:
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    @Override
    public E higher(final E e) {
        return decorated().higher(e);
    }

    @Override
    public E lower(final E e) {
        return decorated().lower(e);
    }

    @Override
    public E pollFirst() {
        return decorated().pollFirst();
    }

    @Override
    public E pollLast() {
        return decorated().pollLast();
    }

    @Override
    public NavigableSet<E> subSet(final E fromElement, final boolean fromInclusive, final E toElement,
            final boolean toInclusive) {
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