#!/usr/bin/env python


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


def work((N, vList)):
    vList.sort()
    
    cntList = []

    idx = 0
    while idx < N:
        cnt = 1
        while idx + 1 < N and vList[idx] == vList[idx + 1]:
            idx += 1
            cnt += 1
        cntList.append(cnt)
        idx += 1
    
    ans = 0
    while len(cntList) >= 3:
        if cntList[0] == 0:
            del cntList[0]
            continue
        
        if cntList[1] == 0:
            del cntList[1]
            continue
        
        if cntList[2] == 0:
            del cntList[2]
            continue
        
        ans += 1
        cntList[0] -= 1
        cntList[1] -= 1
        cntList[2] -= 1

    print ans


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