def extract_symmetric(test_list):
  
  temp = set(test_list) & {(b, a) for a, b in test_list}
  res = {(a, b) for a, b in temp if a < b}
  return (res) 
def heap_queue_largest(nums,n):
  import heapq as hq
  
  largest_nums = hq.nlargest(n, nums)
  return largest_nums