list1 = [0, 1, 2, 3]
x = 3

all_permutations = []

print(list1)

while len(all_permutations) != 23:
    x -= 1
    list1[x], list1[x+1] = list1[x+1], list1[x]
    all_permutations.append(list1[:])


    if x == 0:
        list1[2], list1[3] = list1[3], list1[2]
        all_permutations.append(list1[:])    < < < < < < <      I forgot to add this line

        while x != 3:
            if len(all_permutations) == 23:
                break

            else:
                pass
            x += 1
            list1[x-1], list1[x] = list1[x], list1[x-1]
            all_permutations.append(list1[:])


        list1[0], list1[1] = list1[1], list1[0]
        all_permutations.append(list1[:])


    else:
        continue



for perm in all_permutations:
    print(perm)