class FenwickTree:
    """
    Implements fenwick tree
    """

    def __init__(self, N: int):
        """
        Initializes fenwick tree with size N, indexed from 0 to N-1.
        """
        self.__N = N
        self.__data = [0] * N

    def add(self, pos: int, val: int):
        """
        Applies A[pos] += val
        """
        assert 0 <= pos < self.__N
        pos += 1
        while pos <= self.__N:
            self.__data[pos - 1] += val
            pos += pos & -pos

    def sum(self, s: int, e: int):
        """
        Calculates sum(A[s:e]), where 0 <= s <= e <= N.
        """
        assert 0 <= s <= e <= self.__N
        return self.__sum(e) - self.__sum(s)

    def __sum(self, pos: int):
        ans = 0
        while pos > 0:
            ans += self.__data[pos - 1]
            pos -= pos & -pos
        return ans


def main():
    T = int(input())
    for i in range(T):
        N = int(input())
        *L, = map(int, input().split())

        D = {}
        for i in range(N):
            D[L[i]] = D.get(L[i], 0) + 1

        A = sorted(D.values(), reverse=True)
        print(min(sum(A)//3, sum(A[2:])))


if __name__ == '__main__':
    main()