list approach due nested order

[Gribouillis]

Combining frozenset with unique_everseen yields my preferred solution

from more_itertools import unique_everseen

def create():
    yield ['a', 'b']
    yield ['b', 'a']
    yield [1, 2]
    
unique = list(unique_everseen(create(), key=frozenset))
print(unique)

Output:
[['a', 'b'], [1, 2]]