Write a function to find the combinations of sums with tuples in the given tuple list. https://www.geeksforgeeks.org/python-combinations-of-sum-with-tuples-in-tuple-list/
from itertools import combinations 
def find_combinations(test_list):
  res = [(b1 + a1, b2 + a2) for (a1, a2), (b1, b2) in combinations(test_list, 2)]
  return (res) 