def add_to_pairtree(output_path, meta_id):
<EOL>paired_path = pair_tree_creator(meta_id)<EOL>path_append = '<STR_LIT>'<EOL>for pair_dir in paired_path.split(os.sep):<EOL><INDENT>path_append = os.path.join(path_append, pair_dir)<EOL>combined_path = os.path.join(output_path, path_append)<EOL>if not os.path.exists(combined_path):<EOL><INDENT>os.mkdir(combined_path)<EOL><DEDENT><DEDENT>return combined_path<EOL>
Creates pairtree dir structure within pairtree for new
    element.