class Solution:
    def groupStrings(self, strings: List[str]) -> List[List[str]]:
        #TC: O(len(strings)*M) M: maximum length of elements in strings
        #SC: Maximum (O(len(strings)*len(strings)*M))
        #Use tuple to represent string pattern
        #Same string with the same pattern in the Dict
        Dict = {}
        for ele in strings:
            pattern = ()
            for i in range(len(ele)-1):
                diff = (ord(ele[i]) - ord(ele[i+1])) % 26
                pattern = pattern + (diff, )

            if pattern not in Dict:
                Dict[pattern] = [ele]
            else:
                Dict[pattern].append(ele)

        res = []
        for key in Dict:
            res.append(Dict[key])

        return res