Combinations

[mnnewick]

Here is my code:
#Task 3 Theif#

import itertools
n1 = input("Enter your 1st known number? ")
    

n2 = input("Enter your 2nd known number? ")


n3 = input("Enter your 3rd known number? ")


n4 = input("Enter your 4th known number? ")

numbers = (n1,n2,n3,n4)

verify = ()
while verify != "y" or verify != "n":
  print(n1, n2, n3, n4)
  verify = input(int("Is this correct? (y/n)")
if verify == "y":
    set(list(itertools.permutations([1, 2, 2, 4])))

Task:
Design and write a program that displays all the possible combinations for any four numerical digits entered by the user. The program should avoid displaying the same combination more than once.

PROBLEM:
The code above is what I have got but it keeps giving me errors. Can someone point out where I am wrong and correct it please, I have been stuck on this for several days now.

If I am off track and doing it wrong,can someone send an answer so I can see where I went wrong as I have no clue