```
class Solution:
def groupAnagrams(self, strs):
"""
:type strs: List[str]
:rtype: List[List[str]]
"""
# Use prime number property
# product of unique product numbers is unique
# assign each char to unique prime number
# There is you go, so eat ate will result in same product
prime_numbers = [ 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101]
prime_values = {}
for string in strs:
prime = 1
for char in string:
prime = prime*prime_numbers[ord(char)-97]
if(prime not in prime_values.keys()):
prime_values[prime] = [string]
else:
prime_values[prime].append(string)
return(list(prime_values.values()))
```