Symmetric pairsExtract all the pairs which are symmetric, i.e for any (x, y), we have (y, x) pair presentConstraints:NAExample:Input :36 72 37 6Output : (6, 7)

It seems like there is a misunderstanding in the question. The example provided does not match the problem statement.

However, I can provide a general solution for the problem statement: "Extract all the pairs which are symmetric, i.e for any (x, y), we have (y, x) pair present".

Here is a Python solution:

def find_symmetric_pairs(lst):
    # Create an empty set to store pairs
    pairs = set()

    # Create an empty list to store symmetric pairs
    symmetric_pairs = []

    # Iterate over each pair in the list
    for pair in lst:
        # Create a reversed version of the current pair
        reversed_pair = tuple(reversed(pair))

        # If the reversed pair is in the set of pairs, add it to the list of symmetric pairs
        if reversed_pair in pairs:
            symmetric_pairs.append(pair)

        # Add the current pair to the set of pairs
        pairs.add(tuple(pair))

    return symmetric_pairs

You can use this function like this:

pairs = [(1, 2), (2, 1), (3, 4), (5, 6)]
print(find_symmetric_pairs(pairs))

This will output:

[(2, 1)]

This means that the pair (2, 1) is symmetric to (1, 2).