Remove duplicate entries when it occurs more than twice

Suppose, I have a list below

list = [1,1,1,1,2,3,1,4,4,4,4,3,3]

I want to remove the duplicates which occur more than twice. Basically, I want like this

[1,1,2,3,4,4,3,3]

I use the following code

i = 0
while i < len(list) -2:
    if list[i] == list[i+2]:
        del list[i+2]
    else:
        i = i+2

this code gives me the following output

[1, 1, 2, 3, 1, 4, 4, 4, 3, 3]

Here 4 occurs thrice, but I want twice. How can I modify the code or any other method that could give the desired output?

>Solution :

i = 2
while i < len(list):
    if list[i] == list[i-1] and list[i] == list[i-2]:
        del list[i]
    else:
        i += 1
print(list)

output :

[1, 1, 2, 3, 1, 4, 4, 3, 3]