# Maximum Product of Word Lengths

Given a string array`words`, find the maximum value of`length(word[i]) * length(word[j])`where the two words do not share common letters. You may assume that each word will contain only lower case letters. If no such two words exist, return 0.

**Example 1:**

```
Input: ["abcw","baz","foo","bar","xtfn","abcdef"]
Output: 16 
Explanation: The two words can be "abcw", "xtfn".
```

**Example 2:**

```
Input: ["a","ab","abc","d","cd","bcd","abcd"]
Output: 4 
Explanation: The two words can be "ab", "cd".
```

**Example 3:**

```
Input: ["a","aa","aaa","aaaa"]
Output: 0 
Explanation: No such pair of words.
```

## Solution

```
class Solution {
    public int maxProduct(String[] words) {

    }
}
```