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#!/usr/bin/env python3
from collections import defaultdict
for _ in range(int(input())):
n = int(input())
s = map(int, input().split())
d = defaultdict(int)
for i in s: d[i] += 1
result = 0
for value in s.values():
if value % 2:
pass
else:
result += value * (value-1) // 2
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