human
Write a function to flatten the list of lists into a single set of numbers. Here is a solution in Python:
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What is a the Python code you requested?
assistant
#Here is the Python code you requested.
 def extract_singly(test_list):
  res = []
  temp = set()
  for inner in test_list:
    for ele in inner:
      if not ele in temp:
        temp.add(ele)
        res.append(ele)
  return (res)