src/main/java/org/apache/commons/collections4/multimap/AbstractMultiValuedMap.java [803:832]:
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    @Override
    public boolean putAll(final Map<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
    }

    /**
     * Copies all of the mappings from the specified MultiValuedMap to this map.
     * The effect of this call is equivalent to that of calling
     * {@link #put(Object,Object) put(k, v)} on this map once for each mapping
     * from key {@code k} to value {@code v} in the specified map. The
     * behavior of this operation is undefined if the specified map is modified
     * while the operation is in progress.
     *
     * @param map mappings to be stored in this map, may not be null
     * @return true if the map changed as a result of this operation
     * @throws NullPointerException if map is null
     */
    @Override
    public boolean putAll(final MultiValuedMap<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entries()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
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src/main/java/org/apache/commons/collections4/multimap/TransformedMultiValuedMap.java [141:158]:
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    @Override
    public boolean putAll(final Map<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
    }

    @Override
    public boolean putAll(final MultiValuedMap<? extends K, ? extends V> map) {
        Objects.requireNonNull(map, "map");
        boolean changed = false;
        for (final Map.Entry<? extends K, ? extends V> entry : map.entries()) {
            changed |= put(entry.getKey(), entry.getValue());
        }
        return changed;
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