I have some code in which edges are represented as tuple

(vertex_1, vertex_2)

and I have lists of edges that represent planar embedded faces, as for the example below.

I need to search if an edge is present in the list, but I need to return true both if a use (v1, v2) and (v2, v1):

f1 = [(6, 1), (1, 2), (2, 7), (7, 6)]
(6,1) in f1
(1,6) in f1

True
False