Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given a string array words, return the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. If no such two words exist, return 0.
 
Please complete the following python code precisely:
```python
class Solution:
    def maxProduct(self, words: List[str]) -> int:
```