src/main/java/org/apache/commons/collections4/bidimap/UnmodifiableBidiMap.java [109:132]:
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    @Override
    public V put(final K key, final V value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void putAll(final Map<? extends K, ? extends V> mapToCopy) {
        throw new UnsupportedOperationException();
    }

    @Override
    public V remove(final Object key) {
        throw new UnsupportedOperationException();
    }

    @Override
    public K removeValue(final Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Set<V> values() {
        final Set<V> set = super.values();
        return UnmodifiableSet.unmodifiableSet(set);
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src/main/java/org/apache/commons/collections4/bidimap/UnmodifiableOrderedBidiMap.java [119:142]:
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    @Override
    public V put(final K key, final V value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void putAll(final Map<? extends K, ? extends V> mapToCopy) {
        throw new UnsupportedOperationException();
    }

    @Override
    public V remove(final Object key) {
        throw new UnsupportedOperationException();
    }

    @Override
    public K removeValue(final Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Set<V> values() {
        final Set<V> set = super.values();
        return UnmodifiableSet.unmodifiableSet(set);
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