Microsoft : find anagram pairs

Given a set of words in a dictionary, write a program to group all words which are anagrams of each other in to sets.
You can use any C++ STLs or other languages like python if you want to code this..

example:
input:
"bat", "tar", "xyz" , "tab", "tar"

output:
[["bat", tab"], ["tar", rat"],"xyz" ]
(Note: In this example, all words are only of three characters but this is not always
guaranteed. The input may contain words with any number of characters)