src/main/java/org/apache/commons/collections4/bidimap/UnmodifiableOrderedBidiMap.java [102:139]:
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            inverse.inverse = this;
        }
        return inverse;
    }

    @Override
    public Set<K> keySet() {
        final Set<K> set = super.keySet();
        return UnmodifiableSet.unmodifiableSet(set);
    }

    @Override
    public OrderedMapIterator<K, V> mapIterator() {
        final OrderedMapIterator<K, V> it = decorated().mapIterator();
        return UnmodifiableOrderedMapIterator.unmodifiableOrderedMapIterator(it);
    }

    @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
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src/main/java/org/apache/commons/collections4/bidimap/UnmodifiableSortedBidiMap.java [100:137]:
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            inverse.inverse = this;
        }
        return inverse;
    }

    @Override
    public Set<K> keySet() {
        final Set<K> set = super.keySet();
        return UnmodifiableSet.unmodifiableSet(set);
    }

    @Override
    public OrderedMapIterator<K, V> mapIterator() {
        final OrderedMapIterator<K, V> it = decorated().mapIterator();
        return UnmodifiableOrderedMapIterator.unmodifiableOrderedMapIterator(it);
    }

    @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
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