t = gets.to_i
t.times do 
    n = gets.to_i
    a = gets.split.map(&:to_i)
    h1 = Hash.new(0)
    n.times do |i|
        h1[a[i]] += 1
    end
    res = 0
    count = 0
    while true do
        find = false
        h1.each_key do |k|
            if h1[k] > 0
                h1[k] -= 1
                count += 1
            end
            if count >= 3
                count = 0
                res += 1
                find = true
            end
        end
        if !find
            break
        end
    end
    puts res
end