def METHOD_NAME() -> None:
    assert extend_list_deduplicated(["one", "two", "three"], ["four", "five", "six"]) == ["one", "two", "three", "four", "five", "six"]
    assert extend_list_deduplicated(["one", "two", "three", "six"], ["two", "four", "five", "six"]) == ["one", "two", "three", "six", "four", "five"]
    assert extend_list_deduplicated(["one", "two", "three"], ["one", "two", "three"]) == ["one", "two", "three"]
    assert extend_list_deduplicated([], ["one", "two", "three"]) == ["one", "two", "three"]