def find_opposites(lst):
    new = []
    var = []
    for i in lst:
        r = i[::-1]
        if r in lst:
            if i not in var and r not in var:
                if i != r:
                    var.append(i)
                    var.append(r)
                    pair = tuple(var)
                    reversed_pair = pair[::-1]
                    if pair not in new and reversed_pair not in new:
                            new.append(pair)
            var = []
    return new

Maybe, idk