Buggy python submission (verdict: Time Limit Exceeded):
cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

for i, e in enumerate(s):
    """
    要素が何個あるか検査　AND　tmpにないやつ
    ・１：なにもしない
    ・2以上：個数調べてCNT更新。その要素をtmpに記録する
    """
    count = s.count(e)
    if count > 1 and not e in tmp:
        cnt += count*(count-1)//2
        tmp.append(e)
print(cnt)


Fixed submission:
import collections

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

# for i, e in enumerate(s):
#     count = s.count(e)
#     if count > 1 and not e in tmp:
#         cnt += count*(count-1)//2
#         tmp.append(e)
cc = collections.Counter(s)

for cv in cc.values():
    if cv > 1:
        cnt += cv*(cv-1)//2

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
from operator import mul
from functools import reduce

def cmb(n,r):
    r = min(n-r,r)
    if r == 0: return 1
    over = reduce(mul, range(n, n - r, -1))
    under = reduce(mul, range(1,r + 1))
    return over // under
    
cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

for i, e in enumerate(s):
    """
    要素が何個あるか検査　AND　tmpにないやつ
    ・１：なにもしない
    ・2以上：個数調べてCNT更新。その要素をtmpに記録する
    """
    count = s.count(e)
    if count > 1 and not e in tmp:
        cnt += cmb(count, 2)
        tmp.append(e)
print(cnt)


Fixed submission:
import collections

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

# for i, e in enumerate(s):
#     count = s.count(e)
#     if count > 1 and not e in tmp:
#         cnt += count*(count-1)//2
#         tmp.append(e)
cc = collections.Counter(s)

for cv in cc.values():
    if cv > 1:
        cnt += cv*(cv-1)//2

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
from operator import mul
from functools import reduce

# def c(n, r):
#     r = min(r, n - r)
#     numer = reduce(mul, range(n, n - r, -1), 1)
#     denom = reduce(mul, range(1, r + 1), 1)
#     return numer // denom
def cmb(n, r):
    if n - r < r: r = n - r
    if r == 0: return 1
    if r == 1: return n

    numerator = [n - r + k + 1 for k in range(r)]
    denominator = [k + 1 for k in range(r)]

    for p in range(2,r+1):
        pivot = denominator[p - 1]
        if pivot > 1:
            offset = (n - r) % p
            for k in range(p-1,r,p):
                numerator[k - offset] /= pivot
                denominator[k] /= pivot

    result = 1
    for k in range(r):
        if numerator[k] > 1:
            result *= int(numerator[k])

    return result

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

for i, e in enumerate(s):
    """
    要素が何個あるか検査　AND　tmpにないやつ
    ・１：なにもしない
    ・2以上：個数調べてCNT更新。その要素をtmpに記録する
    """
    count = s.count(e)
    if count > 1 and not e in tmp:
        cnt += cmb(count, 2)
        tmp.append(e)
print(cnt)

Fixed submission:
import collections

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

# for i, e in enumerate(s):
#     count = s.count(e)
#     if count > 1 and not e in tmp:
#         cnt += count*(count-1)//2
#         tmp.append(e)
cc = collections.Counter(s)

for cv in cc.values():
    if cv > 1:
        cnt += cv*(cv-1)//2

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
from operator import mul
from functools import reduce

def c(n, r):
    r = min(r, n - r)
    numer = reduce(mul, range(n, n - r, -1), 1)
    denom = reduce(mul, range(1, r + 1), 1)
    return numer // denom

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

for i, e in enumerate(s):
    """
    要素が何個あるか検査　AND　tmpにないやつ
    ・１：なにもしない
    ・2以上：個数調べてCNT更新。その要素をtmpに記録する
    """
    count = s.count(e)
    if count > 1 and not e in tmp:
        cnt += c(count, 2)
        tmp.append(e)
print(cnt)

Fixed submission:
import collections

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

# for i, e in enumerate(s):
#     count = s.count(e)
#     if count > 1 and not e in tmp:
#         cnt += count*(count-1)//2
#         tmp.append(e)
cc = collections.Counter(s)

for cv in cc.values():
    if cv > 1:
        cnt += cv*(cv-1)//2

print(cnt)

Buggy python submission (verdict: Time Limit Exceeded):
from operator import mul
from functools import reduce

def c(n, r):
    r = min(r, n - r)
    numer = reduce(mul, range(n, n - r, -1), 1)
    denom = reduce(mul, range(1, r + 1), 1)
    return numer // denom

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

for i, e in enumerate(s):
    """
    要素が何個あるか検査　AND　tmpにないやつ
    ・１：なにもしない
    ・2以上：個数調べてCNT更新。その要素をtmpに記録する
    """
    if s.count(e) > 1 and not e in tmp:
        cnt += c(s.count(e), 2)
        tmp.append(e)
print(cnt)

Fixed submission:
import collections

cnt = 0
s = []
tmp = []
n = int(input())
for i in range(n):
    string = input()
    string = ''.join(sorted(string))
    s.append(string)

# for i, e in enumerate(s):
#     count = s.count(e)
#     if count > 1 and not e in tmp:
#         cnt += count*(count-1)//2
#         tmp.append(e)
cc = collections.Counter(s)

for cv in cc.values():
    if cv > 1:
        cnt += cv*(cv-1)//2

print(cnt)