def remove_disambiguation(doc_id):
    """
    Normalizes and removes disambiguation info from a document ID.
    """
    doc_id = doc_id.replace('_', ' ').replace('-COLON-', ':')
    if '-LRB-' in doc_id:
        doc_id = doc_id[:doc_id.find('-LRB-') - 1]

    return doc_id