fun main(arr:Array<String>) {
    val testcaseCount = readLine()!!.toInt()
    (1..testcaseCount).forEach { println(getAns()) }
}

fun getAns():Int {
    val itemCount = readLine()!!.toInt()
    val items = readLine()!!.split(" ").map { it.toInt() }.let { a-> a.toSet().map { b-> b to a.count { it == b } }}.toMap().toMutableMap()
    val keys = items.keys.sortedByDescending { items[it]!! }.toMutableList()
    var ans = 0
    while (items.size >= 3) {
        for(i in (0 until 3).reversed()) {
            items[keys[i]] = items[keys[i]]!! - 1
            if(items[keys[i]]!! == 0) {
                items.remove(keys[i])
                keys.removeAt(i)
            }
        }
        ans++
    }
    return ans
}