code: def generate_fortran(func_sigs):
      return "\n".join(
          fort_subroutine_wrapper(*sig) for sig in func_sigs
      )
  
imports: from collections import defaultdict
  from operator import itemgetter
  import os
label_desc: Use image node_id 15 for calling a global function with example usage: generate_fortran(func_sigs) and returns: str