code: def stable_uniq(it):
      seen = set()
      res = []
      for e in it:
          if e not in seen:
              res.append(e)
              seen.add(e)
      return res
  
imports: import functools
  import threading
  import collections
  import contextlib
  import six
label_desc: Use image node_id 7 for calling a global function with example usage: stable_uniq(it) and returns: res