code: def syntax_summary(elem):
      """
      Return a basic summary of markdown syntax to as an example for users
      """
      return SYNTAX_SUMMARY.get(elem.t)
  
imports: import argparse
  import commonmark
  import nbformat
  import os
  import re
  import subprocess
  import sys
  import textwrap
  from pathlib import Path
label_desc: Use image node_id 12 for calling a global function with example usage: syntax_summary(elem) and returns: SYNTAX_SUMMARY