#!/usr/bin/env python


def read():
    return input(), map(int, raw_input().split())


def work((N, vList)):
    vList.sort()

    used = [False for i in range(N)]
    
    A = 0
    B = 1
    C = 2
    ans = 0
    
    while max(A, B, C) < N:
        while A < N and used[A]:
            A += 1

        while max(A, B) < N and (vList[B] <= vList[A] or used[B]):
            B += 1

        while max(A, B, C) < N and (vList[C] <= vList[B] or used[C]):
            C += 1

        if max(A, B, C) < N:
            ans += 1
            used[A] = used[B] = used[C] = True

    print ans


if __name__ == "__main__":
    for i in range(input()):
        work(read())