docs: def pair_tree_creator(meta_id):
      """Splits string into a pairtree path."""
      chunks = []
      for x in range(0, len(meta_id)):
          if x % 2:
              continue
          if (len(meta_id) - 1) == x:
              chunk = meta_id[x]
          else:
              chunk = meta_id[x: x + 2]
          chunks.append(chunk)
      return os.sep + os.sep.join(chunks) + os.sep