After learning a lot about space exploration, a little girl named Ana wants to change the subject.

Ana is a girl who loves palindromes (string that can be read the same backwards as forward). She has learned how to check for a given string whether it's a palindrome or not, but soon she grew tired of this problem, so she came up with a more interesting one and she needs your help to solve it:

You are given an array of strings which consist of only small letters of the alphabet. Your task is to find how many palindrome pairs are there in the array. A palindrome pair is a pair of strings such that the following condition holds: at least one permutation of the concatenation of the two strings is a palindrome. In other words, if you have two strings, let's say "aab" and "abcac", and you concatenate them into "aababcac", we have to check if there exists a permutation of this new string such that it is a palindrome (in this case there exists the permutation "aabccbaa"). 

Two pairs are considered different if the strings are located on different indices. The pair of strings with indices $(i,j)$ is considered the same as the pair $(j,i)$.


-----Input-----

The first line contains a positive integer $N$ ($1 \le N \le 100\,000$), representing the length of the input array.

Eacg of the next $N$ lines contains a string (consisting of lowercase English letters from 'a' to 'z') — an element of the input array. 

The total number of characters in the input array will be less than $1\,000\,000$.


-----Output-----

Output one number, representing how many palindrome pairs there are in the array.


-----Examples-----
Input
3
aa
bb
cd

Output
1

Input
6
aab
abcac
dffe
ed
aa
aade

Output
6



-----Note-----

The first example:  aa $+$ bb $\to$ abba. 

The second example:  aab $+$ abcac $=$ aababcac $\to$ aabccbaa aab $+$ aa $=$ aabaa abcac $+$ aa $=$ abcacaa $\to$ aacbcaa dffe $+$ ed $=$ dffeed $\to$ fdeedf dffe $+$ aade $=$ dffeaade $\to$ adfaafde ed $+$ aade $=$ edaade $\to$ aeddea

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = '#!/usr/bin/env python3\n"""\nCreated on Wed Feb 28 11:47:12 2018\n\n@author: mikolajbinkowski\n"""\nimport sys\n\nN = int(input())\n\nstring_count = {}\nfor _ in range(N):\n    s = str(input())\n    char_count = {}\n    for c in s:\n        char_count[c] = char_count.get(c, 0) + 1\n    s0 = []\n    for a in \'abcdefghijklmnopqrstuvwxyz\':\n        if char_count.get(a, 0) % 2 == 1:\n            s0.append(a)\n    s1 = \'\'.join(s0)\n    string_count[s1] = string_count.get(s1, 0) + 1\n\npairs = 0\nfor s, v in list(string_count.items()):\n    pairs += v * (v-1) // 2\n    for i in range(len(s)):\n        pairs += v * string_count.get(s[:i] + s[i+1:], 0)\n\nprint(pairs)\n\n        \n    \n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: 13427