src/main/java/org/apache/commons/collections4/bag/CollectionBag.java [127:134]:
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    public boolean addAll(final Collection<? extends E> coll) {
        boolean changed = false;
        for (final E current : coll) {
            final boolean added = add(current, 1);
            changed = changed || added;
        }
        return changed;
    }
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src/main/java/org/apache/commons/collections4/bag/CollectionSortedBag.java [98:105]:
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    public boolean addAll(final Collection<? extends E> coll) {
        boolean changed = false;
        for (final E current : coll) {
            final boolean added = add(current, 1);
            changed = changed || added;
        }
        return changed;
    }
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