import sequtils,strutils,algorithm

type
    priorityQue[I:static[int];T:tuple] = array[I + 1,T]
    item = tuple[cost: int,ID : int]
proc push[T](A:var priorityQue; b: T;)=
    const key = 0
    A[0][0] += 1
    A[A[0][0]] = b # A[0][0]はsize、最大のIndex
    var index = A[0][0]
    while index > 1 and A[index][key] > A[index div 2][key]:
        (A[index],A[index div 2]) = (A[index div 2],A[index])
        index = index div 2
proc pop(A: var priorityQue):item = 
    const key = 0
    result = A[1]
    A[1] = A[A[0][0]]
    A[A[0][0]] = (0,0)
    A[0][0] -= 1
    var index = 1
    while index * 2 <= A[0][0]:
        if index * 2 + 1<= A[0][0]:
            if A[index][key] < A[index * 2][key] and A[index * 2 + 1][key] <= A[index * 2][key]:
                (A[index],A[index * 2]) = (A[index * 2],A[index])
                index = index * 2
            elif A[index][key] < A[index * 2 + 1][key]:
                (A[index],A[index * 2 + 1]) = (A[index * 2 + 1],A[index])
                index = index * 2 + 1
            else:
                break
        elif index * 2 <= A[0][0]:
            if A[index][key] < A[index * 2][key]:
                (A[index],A[index * 2]) = (A[index * 2],A[index])
            break
        else:
            break
proc size(A : priorityQue):int=
    return A[0][0]
    
var
    T = stdin.readline.parseInt
for t in 1..T:
    var
        N = stdin.readline.parseInt
        T = stdin.readline.split.map(parseInt)
        i : int
        cnt : int
        ans : int
        a,b,c : item
        A : array[101, item]
        PQ : priorityque[101, item]
    T.sort(system.cmp)
    for j,t in T:
        if j == 0:
            cnt += 1
        elif T[j - 1] != t:
            A[i] = (cnt, i)
            cnt = 1
            i += 1
        else:
            cnt += 1
    A[i] = (cnt,i)
    for a in A[0..i]:
        PQ.push(a)
    while PQ.size > 2:
        a = PQ.pop()
        b = PQ.pop()
        c = PQ.pop()
        a.cost -= 1
        b.cost -= 1
        c.cost -= 1
        ans += 1
        if a.cost > 0:
            PQ.push(a)
        if b.cost > 0:
            PQ.push(b)
        if c.cost > 0:
            PQ.push(c)
    echo ans