you are asked for this: https://en.wikipedia.org/wiki/Complement_(set_theory)#Relative_complement

you are doing this: https://en.wikipedia.org/wiki/Symmetric_difference

i am close to giving up at this point, filtered the 2 arrays to get the unique values for both and the returned the concatenated unique values as an array, i even passed the sample arrays and got the exact same answers, but it's still not accepting my answer