code: def merge_boxes(box1, box2):
      return (
          min(box1[0], box2[0]),
          min(box1[1], box2[1]),
          max(box2[2], box1[2]),
          max(box1[3], box2[3]),
      )
  
file_path: pdf-to-markdown/marker/bbox.py
imports: import fitz
label_desc: Use image node_id 2 for calling a global function with example usage: merge_boxes(box1, box2) and returns: min,  min,  max,  max