Could someone explain to me how the line below works for the description?

if 2 < len(cells & get_neighbours(x, y)) < 4 + ((x, y) in cells)

from my understanding the above would match on 3 for a dead cell and 3 or 4 for a living cell but the description for the challenge dictates 3 for a dead cell and 2 or 3 for a living cell (not 3 or 4), would really appreciate if someone could help me figure out what I'm missing?

And sorry about the code formatting, not sure what the delimeters are here, please let me know and I'll edit

For clarity, the ones I mention taking 3-4 seconds are the given tests on the webpage, these ones in this case: import Test.Hspec
import Test.QuickCheck

import Josephus (josephus)

spec :: Spec
spec = do
describe "josephus" $ do
it "works with integers" $ do
josephus [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 1 shouldBe [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
josephus [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 2 shouldBe [2, 4, 6, 8, 10, 3, 7, 1, 9, 5]

it "works with strings" $ do
  josephus "CodeWars" 4 `shouldBe` "esWoCdra"

Ahh, googling only returned splitAt, wish I had found splitOn