code: def make_blas_pyx_preamble(all_sigs):
      names = [sig[0] for sig in all_sigs]
      return blas_pyx_preamble.format("\n- ".join(names))
  
imports: from collections import defaultdict
  from operator import itemgetter
  import os
label_desc: Use image node_id 5 for calling a global function with example usage: make_blas_pyx_preamble(all_sigs) and returns: blas_pyx_preamble