src/main/java/org/apache/commons/collections4/trie/AbstractPatriciaTrie.java [2455:2462]:
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    private void writeObject(final ObjectOutputStream out) throws IOException {
        out.defaultWriteObject();
        out.writeInt(this.size());
        for (final Entry<K, V> entry : entrySet()) {
            out.writeObject(entry.getKey());
            out.writeObject(entry.getValue());
        }
    }
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src/main/java/org/apache/commons/collections4/bidimap/TreeBidiMap.java [2208:2215]:
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    private void writeObject(final ObjectOutputStream out) throws IOException {
        out.defaultWriteObject();
        out.writeInt(this.size());
        for (final Entry<K, V> entry : entrySet()) {
            out.writeObject(entry.getKey());
            out.writeObject(entry.getValue());
        }
    }
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