code: def most_common_block_type(self):
      counter = Counter(
          [s.block_type for l in self.lines for s in l.spans]
      )
      return counter.most_common(1)[0][0]
  
imports: from collections import Counter
  from typing import List, Optional, Tuple
  from pydantic import BaseModel, field_validator
  import ftfy
  from marker.bbox import boxes_intersect_pct, multiple_boxes_intersect
  from marker.settings import settings
label_desc: Use image node_id 5 for calling the Block obj's underlying member method code with example usage: obj.most_common_block_type() and returns: counter