code: def width(self):
      # Add 1 because Class2=0 cannot be used but needs to be encoded.
      return len(self.column_indices) + 1
  
imports: import logging
  import os
  from collections import defaultdict, namedtuple
  from functools import reduce
  from itertools import chain
  from math import log2
  from typing import DefaultDict, Dict, Iterable, List, Sequence, Tuple
  from fontTools.config import OPTIONS
  from fontTools.misc.intTools import bit_count, bit_indices
  from fontTools.ttLib import TTFont
  from fontTools.ttLib.tables import otBase, otTables
label_desc: Use image node_id 4 for calling the Cluster obj's underlying member method code with example usage: obj.width() and returns: unknown