new_contents: import random
  
  items = [random.randint(-50, 50) for i in range(100)]
  expected = 27
  
  print(items)
  
  seen = set()
  
  for i in items:
      if expected - i in seen:
          print(i, expected - i)
      seen.add(i)
  
  print(seen)
  
subject: Create two_sum.py